Opinions help!!

I had sex and the condom kept on breaking on every replacement! He didn't seem to have any Precum but he definitely didn't cum and the day I was spotting cause the next day I got my period that cycle I had taken plan b so after this scenario I couldn't take it again what are the chances of getting pregnant I'm getting on the pill soon ! I asked my mom she said that I am fine but deep down it is bothering me please comment that will really help me