help!!!

me and my boyfriend had sex last sunday, I was unable to get my birth control from the pharmacy until Thursday. We used a condom but he pulled it off when it pulled out and just came on my stomach. I took a plan b afterwards just in case because I knew I wasn’t going to be getting my birth control. i’ve doubled up since then every night trying to get back on track, i’m back on track now. There’s no chances of pregnancy right? since I took a plan b the next day?