How possible is it?

So I just stopped taking birth control on the 10th of this month. Just days after my boyfriend and I had sex, and then two days later we had sex again. Both times unprotected because condoms irritate my skin, and both times he had finished in me. We also had sex last night but that time he did not finish in me(I know I'm sorry tmi) And we had sex March 9th. how possible is it to get pregnant after you stop taking birth control? I'm trying to remember the two first days him and I had sex after but I can't remember. If I figure it out I'll let y'all know.