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Need help in finding out the conception date

Today I just found out that I am 5 weeks and 1 day pregnant trying my hardest to figure out when I may have conceived. As I recall my last period day was 30/31 May and started roughly I think the 26/27 May. I had unprotected sex on 19 May but used the pull out method and seemed ok, never had sex until the 29/30 and 31st of May still lightly bleeding from having periods and gradually lightened and finished up on the 31 May to the 01 June. Roughly recall had intercourse without protection on the 30 May and 31 May want to know when I conceived am I pregnant from the 19th of May hoping im not.
Asked On : Sun, 8 Jul 2012
Answers:  2 Views:  45
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General & Family Physician 's  Response
Hi Rachael,

Congratulations!

Normally the fertile days are around ovulation which usually occurs 14 days before the first day of your period. In general, the fertile period in a cycle starts from the number of day calculated by shortest cycle minus 18 days and ends on the number of day calculated by longest cycle minus 11 days. So, if your shortest cycle is 28 days and longest is 35 days, your fertile days in a cycle can vary from (28-18) = 10th day to (35-11) = 24th day, where first day of your cycle is the first day of your period.

But that is not a hard and fast rule and a lot depends on the regularity of your cycle. That being said, in your case, it is a possibility that if you had sex around 30th or 31st May, even though it was last day of your period, the sperms may have been able to survive till the time you ovulate. I am assuming that you must have had a TVS (sonogram) that confirmed your dates. Usually the first trimester ultrasound is very reliable in terms of dating. So if it says that your are 5 weeks and 1 day pregnant (the first day being the first day of your LMP) today, Jul 8th, it is less likely to go as far back as 19th may for your conception day. Hence, my best guess is that you may have conceived somewhere in the month of June (probably 2nd or 3rd week of June). If you have more doubt, it would be a good idea to discuss this with your OBGYN who did your sonogram and she will be able to provide you with more details.

Hope that helps.

Take care and all the best for your pregnancy.
Answered: Sun, 8 Jul 2012
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General & Family Physician Dr. Sourav Ganguly's  Response
HI tran.rachael.

THANKS FOR YOUR QUESTION.

AS YOU HAD MENSTRUAL CYCLE ON LAST WEEK OF MAY SO YOU WAS NOT PREGNANT FROM 19 TH MAY.

YOU PROBABLY BECAME PREGNANT FROM YOUR INTERCOURSE 30/31ST MAY.THOUGH THIS TIME YOU WERE IN SAFE PERIOD AND PROBABLY YOU WERE MENSTRUATING AT THAT TIME SO A PREGNANCY AT THAT TIME IS ALSO VERY UNLIKELY BUT IF YOU DONT HAVE ANY INTERCOURSE AFTER 31ST MAY AND YOUR FETUS GESTATIONAL AGE IS AROUND 5 WEEKS SO YOU WERE PREGNANT FROM 30/31ST INTERCOURSE.I AM SURE ABOUT THAT.

BEST WISHES,

DR SOURAV GANGULY
Answered: Sun, 8 Jul 2012
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