Could I get pregnant from not getting off his penis in time?

My boyfriend and I had some amazing sex last night. It's usually always amazing, but last night, I guess since we had a heated argument was off the charts. Anyways, when it came time for him to cum, I didn't realize it because I was on top and thoroughly enjoying myself, and I think he came a bit inside me. I feel like I didn't get off in time and some of his swimmers got in. Yes, we used "the pullout method", but does that mean I could get pregnant? (Yes, I'm ovulating.)