Big Mistake

So I had sex on Tuesday around 12 something in the am. I was on my third day of Birth control and we all know that it doesn’t work unless you’ve been on it for 7 days. Anyway my boyfriend ejaculated inside of me and I pushed out as much as I could but we all know sometimes that doesn’t always work. Could I still get pregnant? I’m still gonna continue taking the birth control pills, and I was thinking about buying a Plan B also. I’m not ready for a baby right now