me and my girlfriend are having dry sex.....and we had grinding.... she is on top of me... and iam wearing a short and inside an inner wear and she is in her innerwear... the previous time i ejaculated was half an hour before and i didnot pee afterwards... and during grinding once I saw my penis almost out of boxer or it may be outside..... and iam not sure the pre ejaculation during that touched her innerwear or not.... but is there any chance that it might cause pregnancy....