The possibility of being pregnant.

Patient: I am extremely worried about possibly being pregnant. My boyfriend and I were “having sex” with our clothes; actually it really isnt even “having sex” but now ive been having the symptoms of pregnancy. Im not sure if im just paranoid and i dont know if ive been feeling this way because i am a virgin an it is my first time even doing anything like this. The first time we did this was about a month and a half ago and ever since i have noticed myself different. Is it possible to get pregnant if i was wearing jeans and my underwear and he had his jeans and boxer? What is the possibility?