Help!

I am on my second pack of starting BC again. first month I had 2 weeks of bleeding and the dr. said the pill was not effective and as a result I ovulated. This month I had taken 3 days of the pill before having unprotected sex, which according to the app landed on a fertile day. Now I think I am experiencing pregnancy symptoms...I have one more week of the pill before my period. could I possibly be pregnant? Has this happened to anyone before?