 [ Symptoms ] how long does sperm stay active in the body my daughter has a problem in that she had sex with her ex partner on the 22 nd feb and then had sex with another guy on the 14th mar she is now pregnant she had a scan which the scanner tells her she is 22 and a half weeks how long can sperm live in the fallopian tubes hanging around for eggs to fertilise when she had the scan the person said that the legs were 24 the arms were 23 and the head was 22 my daughter partners is now saying the baby cant possibly be his and she is convinced it is [ Disease ] condoms can leak so your still taking your chances most contraceptive pills put a disclaimer on the package guaranteeing only 99 effectiveness pulling out is not effective as a small amount of semen might still seep in even when you pull out my opinion your best bet is to have a vasectomy andor a tubal ligation