chances of getting pregnant after switching BC pills?

AL
How high is my chance of getting pregnant after switching birth control pill companies?   I just went from the brand name to the generic. I used over a week of the new one, maybe like 2 weeks so I’ve already been on it a while. (So we’re past that typical wait 7 days before having sex on a new birth control rule / use extra protection). He came in me yesterday lol. Should I go buy the morning after pill, bc I don’t really feel like buying it if I don’t need to. I should be okay right? Or bc since I switched not too long ago my chances of getting pregnant is higher? How long do you need to wait before not using a backup method of protection? Thank you!