What do you think please let me know

I had sex yesterday using a condom no birth control we were checking inbetween but didn't seem to tear or anything he didn't cum at all but not 100% of the condom was still intact when he took it off also wasn't sure if some Precum could have came in contact with the outside of the condom while we were putting it on. Today I went and got plan b to ease my mind as in a day or two I will be in my fertile window! I don't know if I did good and I am wondering if there's a chance I can get pregnant, does anyone know or have been through this before please let me know what you think