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How can I tell if I`m the father of this baby?

hello alex,
i am writting to ask how u could tell who`s baby it is... i have a girl claiming that it is my baby but she said she fell pregnant on the 5th of january... but i didnt sleep with her till the 9th and she was sleeping with another guy for a couple of months b4 me... i know it goes from her last period but im having trouble figuring out how its mine... do u think she is right... its really got me stumped...
thanks phill

Sarah...
Answer: Hi Phill, Unfortunately the only accurate way that you can check paternity of a baby is to have a DNA check after the birth. A woman with a 28 day cycle will ovulate on day 14 of her cycle and is fertile for around 24 hours and sperm can live for around 3 days as well. The dates are calculated on the first day of her last period (and conception occurred around 14 days after this date). If a woman has a shorter or longer cycle the dates and conception changes – a shorter cycle she will conceive earlier in her month and a longer cycle she will conceive later. I hope that this helps. Best wishes, Alex
Answered: 22 Jul 2008