BC and TTC

I need help you guys! I was off birth control for a week and started a new pack for only 3 days and decided to stop it. It has been a week since I've stopped it and during this time u have had 3 days of withdrawal bleeding and unprotected sex 3 times. Is there anyway I can be pregnant? I've taken ovulation tests for the past 7 days and it shows nothing. I also took a test and it said not pregnant. Help!