Chances

So like I stated the other day my boyfriend had unprotected sex. He did not cum in me but he did cum on my back which I was unaware of. I heard him say something so I looked back. I started to get up and felt something go into my crack and drip downward. He said it got onto my lips so he supplied with with a paper towel so I had wiped it with a paper towel and then showered off right after. I then took the morning after pill around 30 min to an hour later. Then the next day we had sex again but protected sex of course. What are the chances of me getting pregnant? I do not know when I ovulate or any of that because I’m irregular.