Sperm can live for up to 3-5 days. So if you were with someone on March 25th.. It would be that persons child rather than the person you were with on the 12th. This information is also based on if you are regular with your cycles and based on a 28 day cycle too. (which is fairly the norm)
If in major doubt, the best thing would be for a blood test after the baby is born which would be 99.9 correct.
Other wise to go by the dates of conception and due dates.. whom ever you had sex with around the 28th would be a very good chance of being the father.
Does that help?
Edited by eidnil on July 24 2005 at 1:08 PM