First time having sex

I lost my virginity a couple weeks ago which sadly was a drunk one night stand and I couldn’t control myself. I’m on birth control and have been for a couple months, and haven’t forgotten to take a pill. I took plan B when I lost my virginity cause he didn’t use a condom/pulled out and I’m so scared to get pregnant so the plan B really threw my cycle off. I really want to have sex with this guy I’ve been talking to, who’s like my dream man!!! If keep taking the pill correctly not forgetting a pill/taking it at the same time everyday and we use a condom, even though plan B threw my cycle off I won’t have a chance of getting pregnant right? The only reason I haven’t really had sex is because I️ have a huge irrational fear of getting pregnant and I never really learned too much about this stuff... if you could give me advice on how to not get pregnant and stuff and what to do when I have sex with my dream man LOL!