Pain durning ovulation?

Sabrina • Sabrina 20|| Jonah 21|| together since 2011 ❤️ || TTC babby 1
So I ovulated late (according ovulation kit) on CD18 which is normal for I'm irregular. But for the first time EVER I have really bad cramps. I seriously feel like I have my period. I feel gross and have pain on my left lower side. What does this mean?!