please help me! I need some input

Ok, so I am ovulating today. Glow tells me I am, and I'm also having the cramps. I always know when I am ovulating. My boyfriend and I had sex last night, doggy style. He kept pulling out to keep from cunning. We didn't use protection, he pull out a few times before he actually got off and he also pulled out when he was getting off. I know that it's possible to get pregnant from pre-cum, but that's it unlikely. I just want to know if him pulling out constantly could have increased the chances of me getting pregnant. If it could have caused more sperm to be at the tip of his penis. Please give your input. Don't be afraid to hurt my feelings. I want honest opinions! Please.