Advice please!!!!

Ok, I need some advice. I’m on sprintec and my boyfriend had a slip up tonight.. he ejaculated not in me but I guess the best way to describe it is right below/ around my vaginal area. I’ve been taking birth control and have about a week and a half of pills left. What is the likelihood that I get pregnant? Should I waste my money on a plan B or should I be ok? I have taken it consistently except for like 2 different days, 1 day I took it 6 minutes late and yesterday I took it 30 minutes late. Ladies, please give me your advice. Is it harder to get pregnant than I think?!