question: hi doc...i have a query on behalf of a friend..she's taken several dettol pregnancy tests..the firt time the mixture was brownish but the last two times there was an oily layer on top.The problem is that she is now convinced that she is pregnant even though she has never had sexual intercourse.She read somewhere that when a man ejeculates,the sperm can stay active for up to 24hours and she has got it in her head that some stranger's sperm entered her when she used a public toilet and that is how she may have gotten pregnant.I on the hand doesnt believe she is.When she gets her period it is usually accompanied with extreme period pain and heavy bleeding..She got it today but in a very mild form which is totally different from the way she usually gets it.Is it possible that she may have realy gotten pregnant from stray spermcells?