Trying for baby #2

Hi everyone, so I’m ttc my second baby now and I’m in month 1. I wasn’t REALLY trying this month since it’s my first month off the pill and I was going to wait, but I was almost positive that I ovulated on 10/12/19 because I felt the pain from it, so we BD one time that day. I know the chance of me being pregnant is really slim. My question for you is when do I start testing? I haven’t had a “real” period off the pill yet so I have no idea when it’s due🤦🏻‍♀️