Help!

I thought I ovulated on CD14 - took an acularlos test on CD15, which showed an elevated LH, but wasn’t positive. Had unprotected sex on CD17. Decided to take an ovulation test on CD18, which was positive and ovulation estimated CD20. I had my IUD removed a couple of months ago. Prior to that, I ovulated mid-cycle. What are the chances of getting pregnant?! When should I test? It seems so late in my cycle to ovulate! Thanks!