Could I get pregnant? Or do I have to wait?!

My period is late but all my tests have come back negative. Definitely not pregnant (17 dpo). I’m all messed up because this will be the first period since going off the pill. I had all the ovulation symptoms though. So I’m pretty sure I did ovulate. Is there any chance I could get pregnant before I’m able to have my period. The second I was late the app quit telling me percentages so idk if there’s any chance or not. I’m just 3 days late today.