What are the chances that I am pregnant?

My partner and I have been sexually active with each other but we never had sexual intercourse. About a month ago, we were fooling around and we had our clothes on. However, I don't know what was going through his mind when he thought that ejaculating onto my back would have been a good idea. Of course, I freaked out and he wiped off the semen before dumping some rubbing alcohol onto my back. Anyway, I was upset, so I went home and I took a long, hot shower. A couple of days later, I got my period and it was pretty normal. However, about a week ago, I was looking at some stuff on the Internet and they were saying that you could get your period and still be pregnant. I was mortified. I think that I was so afraid of being pregnant that I actually started to experience pregnancy symptoms. I would be nauseated all day and I wouldn't want to eat anything. I'm a virgin and I thought I would be ready for stuff like this but clearly, it looks like I'm not. Today, I was starting to feel better and I was less convinced that I'm pregnant. Not too long ago, I went to the bathroom and I looked down at my underwear and I saw white, sticky discharge and a few streaks of fresh, red blood, as well as cramping. I went on Google and I found that this is another pregnancy symptom. I'm starting to freak out again. What are the chances that I am pregnant?