Condom ripped

On saturday night, I had sex. The condom ripped, so we stopped. When he took it off, there was cum, but we weren’t sure who’s it was. He pretty much always knows when he’s about to cum, but I don’t. I don’t usually have an orgasm, but I have came a couple times. I didn’t take Plan B the next day because I’m scheduled to start my period on Wednesday, so I didn’t think it was necessary. Should I be worried? Or was I right?