Me and my girlfriend was having some fun time and i had an underwear a knicker and she had her underwear, pants and a top which covers upto her butts.My pants were wet due to precm.I was sure that I have not ejaculated..and last ejaculation was last day.She is sure that her dress wasnt wet and she had no discharge.If some precm stain had in her dress..is that precm if it contains sperm can cause pregnancy.?