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Hi, It's Dr. C. Thanks for asking for me.
That's not true, new sperm doesn't remove old sperm. There are even situations where women have had twins with different fathers!!
Let me review my previous answers with you to refresh my memory.
3-5 is quite common; 5-7 is rare. It only takes one.
It would be a very rare situation to have sperm last from the 22nd to the 29th. It's MUCH more likely from your boyfriend.
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I'm not familiar with that idea but it only takes one to make it. It does sound like your boyfriend is much more likely to be the father based on the fact that it would require the other partners sperm to live for 7 days which is not likely.
You're welcome. Have a good weekend.
Well the embryo starts developing right away but is free floating for about 7 days inside the fallopian tube before making it's way to the uterus for implantation. Implantation starts at about 7 days after conception and takes about 7 days.
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