Plan b and nervous

My boyfriend and I got a little to rough and didn't realize the condom break until it was to late. We bought plan b because I stress out to much. And less than 24 hours, I took it as soon as possible, but I'm nervous. I took it last month because of an accident we had. Also, What's the cheapest birth control? We have insurance for the doctor visits, but not for meds. Sorry this is so long. 😶😶