Is it a twin line flashing on your pregnancy test strip? Congratulations Mommy-would-be! Definitely, you are wondering how old the little darling inside you is? Just after your heart settles from the horripilation, you delve down in the PREGNANCY MATH. Check out these simple tips to calculate Pregnancy in weeks and months or an easy Indian pregnancy month calculator.

Before you encounter questions just quickly recapitulate if you remember your Last Menstrual Cycle (LMP) which is a vital point.

When is my due date?

How many weeks Am I Pregnant?

In which trimester what sort of care should I  take to keep myself and my baby in the best health condition?

So here we are with all easy solutions and answers to your questions.

You may be interested in how to get pregnant fast.

How many Days, Week & Trimester:

It is best to consult a gynecologist at earliest who can determine all details based on CRL or Crown Rump Length determining the gestational age of the baby.

Average Duration


Formula for self-calculation:

1st day of LAST Menstrual Period (LMP) + 40 weeks

Example – If your 1st day of LMP was 20th Feb 2018 then

Solution – 20th Feb 2018 + 40 weeks = 27th November 2018 is your due date of delivery

General formula of calculation by Physicians:

9 months + 7 days of your 1st day of LMP

Solution – 20th Feb + 9 months = 20th November 2018

20th Nov 2018 + 7 days = 27th November 2018

However, out of 20 babies, only 1 takes birth on the due date.

Still not able to calculate your Pregnancy in weeks and months? Use Budding Star’s Pregnancy Due Date Calculator for knowing how many weeks pregnant you are just by entering the first day of your last period.

CRL or Crown Rump Length in getting gestational age of the baby:

Crown Rump Length refers to the measurement of the length of human embryo or fetus. Generally, the length is considered from head to bottom of buttocks. This is done by ultrasound scan. The size and length determine the exact gestational age of the baby. On every trimester ultrasound should be done to know the position and other specifications of the baby.

You may be interested in symptoms of a baby boy or symptoms of baby girl.

Weeks Chart of Pregnancy Months:

Divide 9 months by 3 trimesters

First Trimester1-13 weeks + 6 days1 to 3
Second Trimester14-27 weeks + 6 days4 to 6
Third Trimester28-40 weeks + Date of delivery7 to 9

Week is just calculated like your age. The first year of baby birth is considered as 0 year and respective months. And by the time baby complete one full year and drop to the second year he/she is said 1 year old. Similarly, when you are on your 2nd week you are been said as 1 week pregnant by a physician. So formula is;

  X+1 week = X week

Example – 12 +1 week = 13 week

13 is medically considered as 12th week

 Trimesters & Developments & Problems:

  • First trimester – The mass of the cell or embryo starts taking shape and the first organ that develops in the fetus is Heart. In the third week, you can hear the heartbeat of the tender life inside you. Take care of your nutrition as the same is nurturing the baby too. It is the toughest phase hence morning sickness, nausea, and weight loss may happen.
  • Second Trimester – In these months the fetus gets a well-defined face, eyes, eyelids, toes, hands, nails and other organs also develop. These days you feel much better. You may gain weight, get a baby glow, feel more relaxed as by now you are used to and know your next step.

FAQ: how many scans are there in II trimester?

Scans differ in each pregnancy owing to age, medical history or weight, but usually, one ultrasound is done in 2nd trimester after the first one in 1st trimester   

  • Third Trimester – These months the baby can hear, respond to light and touch, can kick and move heads. You are about to deliver and so need to be very cautious.
Come along! Let us explore the world of Pregnancy week by week by looking at fetal development, moods & symptoms with do’s and don’ts and pregnancy-related frequently asked questions.

Strictly maintain Dos & Don’t by Doctor. Take proper precautions, don’t miss out any medicine, and take medical help without any delay in case you doubt any complications.


How can I be four weeks pregnant if I am in my fifth week?

Let’s take an example of a baby, when he turns one, it depicts one year of being alive and we call him/her as one year old even though he is in his second year. Similarly, when one week of pregnancy is completed we call it one week of pregnancy, so you will be one week pregnant in your second week and so just depicts the completion of weeks.

How accurate is my due date?

Due date is just an estimation of when the baby will be born, usually, babies arrive between 37 to 42 weeks of pregnancy or within one week when the due date is expected.

What can an anomaly scan show about my baby?

Anomaly scan or targeted imaging for fetal anomalies scan (4d tiffa scan) is to check if the baby is developing normally or to look where the placenta is lying. TIFFA scan report for a baby boy or TIFFA scan report for baby girl is the most significant scan in 2nd trimester as it also makes sure

  •  the internal organs of the baby are developing correctly or not, 
  • checks the blood flow to the uterus, 
  • detects if there are any birth defects in your baby
  • Checks the cervix and measures the birth canal etc

What is the length of a full-term pregnancy?

A full-term pregnancy lasts from the beginning of 39 weeks to the conclusion of 40 weeks if you’re carrying a single child. A full-term pregnancy is defined as at least 38 weeks if you’re carrying twins. Based on when your baby is delivered, the American College of Obstetricians and Gynecologists (ACOG) has defined the following terminology during pregnancy:

20 weeks to 37 weeks is considered preterm.

37 weeks (early term) From 0 to 38 weeks six days

Full term: 39 weeks From 0 to 40 weeks and 6 days

41 weeks (late-term) From 0 to 41 weeks and 6 days

After 42 weeks and 0 days, the term ends.

Why is your pregnancy determined by your last period?

Why start the clock on childbirth before sperm meets egg (and, in fact, before your ovary ever releases the fated egg that will give birth to your child)? Simply said, the LMP is a more accurate day to track a pregnancy from. Even when you’re a master of cervical mucus and know exactly when you ovulated and when you had intercourse, you’re unlikely to be able to identify the precise time or moment of conception. Because sperm may linger out and wait for an egg to fertilise for three to five days after they come, and an egg can be fertilised for up to 24 hours after it’s been released, there’s a larger window than you might expect.

Happy Pregnancy!

About alka

Recently reinvented her old love of writing. A Literature graduate from Delhi university had a flair for writing ,and has also written for her college magazines and has also done dialogue writing for college drama.
She later on pursued MBA in Human Resources and Marketing with over 4+ years of experience with international exposure. Has been married for more than 8 years and leads a Blissful life with her husband and a son of 6 yrs

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