Condom broke

So I need advise. I’m on a birth control pill and for the most part I take it right on time everyday. Me and my boyfriend last night had sex with a condom and he did not pull out when he ejaculated because we had the condom. When he finished and I got up I had cum coming out of me and we realized the condom had broke. We went right to a drug store and bought a plan B within 45 minutes. Should I be scared that I’m pregnant ?