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It Is Possible To Get Pregnant Before The LMP?

Posted on Wed, 1 Apr 2015

Question: Does a Ultrasound Base your Due date off of LMP or size of the Fetus? And if they use the size of the Fetus do they automatically add two weeks onto that date?

Answered by Dr. Rakesh Madhyastha (1 hour later)

Hello. On ultrasound it is based on the size and weight of the fetus. Regards

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar

Follow up: Dr. Rakesh Madhyastha (3 hours later)

Okay so my LMP was 9/10/14 (would be a due date of 6/17/15) when i had my 1st Ultrasound it stated that the baby was about 6 days ahead, so it made my duedate 6/11/15. So does this mean that i just ivulated early? Or did I get oregnant before my LMP As of today 3/11/15 i am 28 weeks ..and do ultra sounds automatically add the 2 weeks on for gestetional age?

Answered by Dr. Rakesh Madhyastha (9 hours later)

Brief Answer:
Not based on LMP

Detailed Answer:
Hello

Thanks for getting back, I am sorry for the short delay in my reply, I just got back from the hospital.

It is not possible to get pregnant before the LMP.

The ultrasound is a fairly accurate modality of detecting the expected date of delivery (EDD) only in the first two trimesters. Even in the first two trimesters the error can be as high as 8 days. In the third trimester the error can go as high as two weeks. So you should stick to the EDD given during the first trimester by ultrasound

Ultrasound does not automatically add 2 weeks, it actually calculates.

I hope I was clear, if you have any further queries please get back to me

Regards

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar