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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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How Can The Pregnancy Week Be Accurately Calculated?

hi, gm i want to know that my last lmp was on July 23rd and i missed period on august and it came positive. How i have to estimate my weeks, and yesterday i had my transvaginal ultrasound and she told i am 6 weeks 2 days and there is no foetal heartbeat visualized. she told me to wait for 1 week, but when i took report to doctor she told me that your actual weeks are 9 weeks, but its showing only 6 weeks 2 days. what i have to expect from this. plz help me
Mon, 14 Dec 2015
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General & Family Physician,  's  Response
HI,
I understand your concern.
Actually conception is possible after ovulation.. which is on 14th day of menses in 28 days cycle. so it's after minimum 14 days after the last menses. This time varies ( is more or less ) as per pwersonal variation of ovulation (it will be on 16th day in 30days cycle or 12th day in 26 days cycle. It may be variable in irregular cycles )
Naturally is minimum 2 weeks lesser than the period of menstrual delay.
However, in early pregnancy, there can be comparitively exact estimation of pregnancy size.
Again it was 9 weeks heart activity would have been seen .. but it's not still evident. ( mostly it is seen by 7 week sof pregnancy ) this also favours your pregnancy to be smaller than 7 weeks.
Thanks.
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How Can The Pregnancy Week Be Accurately Calculated?

HI, I understand your concern. Actually conception is possible after ovulation.. which is on 14th day of menses in 28 days cycle. so it s after minimum 14 days after the last menses. This time varies ( is more or less ) as per pwersonal variation of ovulation (it will be on 16th day in 30days cycle or 12th day in 26 days cycle. It may be variable in irregular cycles ) Naturally is minimum 2 weeks lesser than the period of menstrual delay. However, in early pregnancy, there can be comparitively exact estimation of pregnancy size. Again it was 9 weeks heart activity would have been seen .. but it s not still evident. ( mostly it is seen by 7 week sof pregnancy ) this also favours your pregnancy to be smaller than 7 weeks. Thanks.