Four days ago, my boyfriend put his unprotected penis inside of me (which had little to no precum on it), for about 30 seconds. We didn't hump and we decided it would not be a good idea to do it, so he took it out. He hadn't *** for a whole week since this happened, so I doubt there were a lot of sperm in his precum. I was fertile then and ovulated about 2 days later. I've been super worried since. Right now I have a mild fever and my stomach hurts, I don't know if that has anything to do with it. How likely is it that I'm pregnant?