How to compute pregnancy weeks?

Question

I'm pregnant and curious about how my doctor determines how many weeks along I am. What's the standard method used to compute pregnancy weeks?

Aditi Phadke · Accepted Answer

Actually, it is super simple yaar. You just have to count from the first day of your last period, even if you conceived later. Most tracking apps do this automatically if you put in your LMP. But of course, the doctor's first scan will give the final confirmation.

Preeti Verma · Answer

Haan, log aksar isme galti karte hain na, conception date se count karne lagte hain. Par humesha Last Menstrual Period ke pehle din se hi start karna hota hai. Aapki gynecologist bhi isi hisab se monitor karegi, toh confuse bilkul mat hona.

Rohan Deshmukh · Answer

I totally get it, counting in weeks instead of months can feel so confusing and unnatural at first. We are so used to saying 'third month' or 'fourth month', but doctors strictly go by gestational weeks. Just start from your last period's start date and count the completed weeks from there.

Simran Kaur · Answer

While counting weeks from your LMP is the standard way, please be very cautious if you have irregular periods or have experienced spotting. During my pregnancy, my manual calculation was off by two weeks, which caused a lot of panic during scans. It is always safest to let a qualified OB-GYN verify the weeks via an ultrasound.

Lijo Thomas · Answer

Clinically, we count the weeks starting from the first day of your last menstrual period (LMP). Each block of 7 days from that date is one week of pregnancy. If your cycles are highly irregular, then this calculation might not be accurate, and you will need an early ultrasound to confirm the gestational age.

How to compute pregnancy weeks?

5 answers

Consult a obstetrics and gynaecologist

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