Took a Plan B on my period 🤦🏽‍♀️

I had sex on the morning of the third day of my period. Condom broke and he ejaculated in me. Took a plan b the same day. At first I didn’t think it was necessary but I didn’t want to risk it. I’m not on birth control but I’m gonna start it after my next period which hopefully comes. I feel my chances of pregnancy are pretty low but I’d like more opinions. Thoughts?