Chances of Pregnancy?

So I have been on Nuvaring for quite some time. Due to life getting very crazy I had put in a new ring on September 12th. I completely forgot about it until I started bleeding seemingly out of nowhere. I didn’t put in another ring until October 17th. This means I put my ring in about a week later than I should have. I had sex on October 18th and since I knew I had messed up my ring schedule used a condom. The condom broke and he ended up ejaculating inside of me. What are the chances of pregnancy under these circumstances?