Worried if my gf is really pregnant.

Me and girlfriend had decided to spend some private time together so we went to a room. We both are vergins. I was using condom all the time and the irony is that I didn't even inserted my penis inside her vagina. She was feeling too much pain so I just rubbed my penis against her vagina putting on a condom. I ijaculated in her hands once and once inside my underwear. We were so wet. I didn't broke her verginity and didn't even tried to insert my penis inside her. Still my gf is worried so much that she wants me to consult a doctor to be sure. This incident happened on 12 april and today is 14th april. My girlfriend is saying that she is feeling light fever and dizziness but it might be caused by her poor diet because she is not eating properly after all this. She is a skinny girl and looks weak since from the time I met her first time. According to me there are no chances of her being pregnant but she is so worried and also making me worried. What should I do to make her sure??