So me and my boyfriend where fooling around one day we had dry sex (humping,grinding) we both had our underwear on. After we where done he went to the bathroom and noticed pre cum on his boxers. So now we are paranoid.I still haven't gotten my period. I was wondering if its because I been taking antibiotics due to sum swelling of a wisdom tooth. Can that be the reason my period is late? Or could i possibly b pregnant from pre cum? Please help!