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Understanding Potential Pregnancy After Recent Sexual Activity - Is It Possible?


Question
My Doctor Says I Have Nothing To Worry About But The Beginning Of June  the 3rd or 4th to be correct,I Had Sex With A Boy (big Mistake)dont ever drink, Two Days Later Started My Period on the 6th  i was sooo releaved, ne ways
I got with my best friend who we now are dating, anyways I got with him on the 25th of June so 3 weeks later , i then found ou i was prego on augest 4th and that scared me cuz i herd it could be the other boy even though i had my period, so i asked  my doctor and she said I conceived the 26th  the latest the 28th and that it isnt  the other boys  because early u-s cant be 3 weeks wrong and that my baby wasnt formed enough to be the other boys she said i was 7w and 2d  give or take a week and that if it was the first guys that i would b further and my baby would have more parts then a brain spine and,heart that i would have been 9 -10 w.should I listen to her or worry? she told me to tell my boyfriend its his i just wanted to no your opinion because i feel so sick sometimes i dont want to be lying to the man i love, are doctors pretty accurate? Could the other guys sperm have stayed alive in my body even after my period 4 about 9 days? I appreciate any one's helpi need to quit stressing i am on bed rest cuz of stress,


Answer
Dear Nicole,

I do apologize for the delay in answering your question. My son was "T-boned" in a wreck last week. I forgot all about coming back online for these questions... I'm sorry for that.

You can relax... I am complete agreement with your doctor!! Early ultrasounds are quite accurate in dating pregnancies. As time has passed and we have been able to visualize more and more pregnancies through the years, we have come to know that pregnancies develop at pretty constant rates for the first 12 weeks. We know that at a certain week, the measurement of the gestational sac and/or embryo should be at a certain point to within a few cms. We also know that at a certain point we should be able to visualize certain things. For instance, at 5 weeks we should be able to see a yolk sac and a 6-7 weeks we can typically see heart activity. Now, after the 1st trimester, babies can begin to grow at different rates due to varying factors - maternal health or lifestyle, uterine conditions, etc,... So, by measuring the gestational sac and CRL (crown-rump length) and also noting the appearance of certain things, such as the yolk sac or heart activity, we can date pregnancies quite accurately to within a few days. The ultrasound would not be off by as much as three weeks.

I hope this has helped you and answered your question. I wish you well.

Brenda