A while ago I had so-called dry sex with my girlfriend. The girl was naked but I had cotton boxers on. After grinding I noticed some shiny stain inside boxers and a bit of sticky greyish fluid on the tip of penis. I have heard that that might be pc, however, I have never encountered with something like that despite I am 20 Y/O.
Is it possible that I might have ejaculated whithout knowing? Risk of pregnancy?
PS. GF took emergency contraceptiton after 34 h. And her periods ended few days before aforementioned event.