What are the chances?

Ok so I’m pretty sure the app I use was wrong it say my ovulation day was the 15th. I believe I ovulated sometime on May 17 because I had very very heavy egg white discharge the whole day and my stomach was hurting pretty bad on the right lower side. I think the stomach pain started sometime around 4pm or later. We had sex later that night with protection. Then we had sex again that next morning without protection and my husband finished inside me and also again a few hours after that and again he finished inside me. (Both unprotected time was May 18) so my question could I have ovulated on the 17 because of my symptoms? Also if I did ovulate could I get pregnant by having unprotected sex the very next day after I think I ovulated? (Btw not sure if this mater but I heard the first 3 months after having a baby your are really fertile well I’m 6 months pp)

Also I’m wondering do ovulation pain happen during ovulation or before ovulation? Because I had the pain around 4pm and it lasted for several hours.