Chance of pregnancy?

Ive been off the pill sice March 1st, has a period on 2/25. I've been using ovulation tests to track my cycle but husband and I didn't use protection Sunday 3/9 and ovulation test came back positive 3/11 saying I would ovulate in 24-48 hours but I believe I ovulated yesterday due to pain in my left side. So I am wondering how likely pregnancy could be since we had sex two days before a positive ovulation test?