<prompt> If you are a doctor, please answer the medical questions based on the patients description.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  <response>: HI, I understand your concern. Actually conception is possible after ovulation. Which is on 14th day of menses in 28 days cycle. So Its after minimum 14 days after the last menses. This time varies is more or less as per personal variation of ovulation it will be on 16th day in 30 days 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 comparatively exact estimation of pregnancy size. Again it was 9 weeks heart activity would have been seen . But Its not still evident. mostly it is seen by 7 week soph pregnancy this also favors your pregnancy to be smaller than 7 weeks. Thanks. 