Hi there. The day after my period ended, my boyfriend and I had "dry humping" kind of sex. He has never penetrated me. The reason I'm concerned is because his penis did make contact with my vagina and right before his sperm came out he lifted me up to prevent his semen from coming in contact with my lady part. I don't have any typical pregnancy symptoms except that I am nauseous but this too occurs right before and during my monthly. I also haven't gotten my period but I'm normally either on time, a few days early or a few days late. I have a normal 28 day cycle, have regular periods and the first day of my last period was on the 24th of May 2015. What is the possibility that I could be pregnant. PS, I am never doing any sexual acts again as the thought of being pregnant is stressing me out. Thank you in advance.

Low, extremely low. Your nausea could be food poisoning or stress or your period coming on.

You'll need to wait until you've missed your period by about two weeks. Taking a pregnancy test at that point will show you if you're pregnant or not.