Could I be pregnant?

I know a lot of people are going to laugh at everything I am about to write. I know I am not pregnant, but I am still worrying that I am. Crazy, right? That's how my mind works, and it is driving me crazy. I am 18 years old and I have currently discovered that I show signs of the mental disorder, OCD. It's hard to accept that I'm not normal, but I also know that God made me this way for a reason. Anyways, me and my boyfriend let things get a little too heated the other day. I am a strong Christian, so I try to not go any further than making out. I was actually on the 3rd day of my period, which means that pregnancy was even less likely than normal. So we were making out and 'rubbing' around. I started obsessing over the thought of his pre cum (if he even had any at all) soaking through is underwear, pants, then my pants, and my underwear, and then somehow getting me pregnant. Even though I am on my period, and have a tampon in. I know you can't get pregnant from making out with clothes on, but my mind somehow took the obsession of pregnancy to a whole new level. Then, he would kind of rub me down there. (On top of my panties). I would hurry and remove his hand or tell him to stop. Every time he would touch me above my panties or rub me there, I would make sure and ask him "Did you wash your hands? If not, have you touched yourself down there lately"? His hands were always clean. Also, he never touched my vagina. Even if he would have, he never had cum or anything, whatsoever, on his hands. It's all just in my mind, and I don't know why I keep obsessing. I just need someone to tell me that I have nothing to worry about. I appreciate all opinions, wether they be good, bad, mean, nice, uplifting, etc. Thank you to everyone in advance.