Pregnant?

Okay so my fiancé and I had sex October 1st, the condom broke and he came inside me. The next day we went to go get a plan b pill and I took it right away at around 9 am. This app says my ovulation days were September 21st-27th. Therefore, I had about 9 days before my next period.. is it possible that I may be pregnant? I am currently at 4 days before next period..