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Pregnancy Date Discrepancy: Understanding Conception Timing


Question
I found out that she started her last period on 9/10 that was also the first day she started the patch.
My girlfriend is on the patch, we had sex for the first time 10/1/04 no condom was used as she told me she latex made her swell up, I pulled out. This was her last patch in the cycle so she should have started her period on or around 10/5/04 we have had no sexual relations prior to this. She was having cramps and nausea, went to the hospital on 10/14/04 and they told her she was pregnant. She told me she started her period on 10/06/04, now its 10/17/04 she tells me she didn't have a period at all. Friends have come to me and told me that she spent the night at another guys house on 9/25/04. I'm a college stundent Biochemistry major so I did the math her last period was between 9/7-9/10 so she should have not been ovulating around the time we had sex. Would conception on 10/01 stop menstration 0n 10/05/04, I thought implation usually stops menstration which would have occured 7-11 days later?  

Answer
If she did not take the patch correctly, and her last period started on September 10, she would have ovulated on September 23. She could have become pregnant if she had sex on September 23,24,25, or 26, so it is possible t hat she could have conceived on September 25. If she has not had her period since September 10, she could not have conceived after the dates I mentioned. A pregnancy test would have shown a positive result after October 14, for sure. If she had a positive pregnancy test on October 14, she could not have had her period on October 5. For some reason, she is not being honest with you.