When did I ovulate??

Shaydi • :) baby dust to you all
I started my period on the 23th and finished it on the 27th and got a positive OPK on the 29th, 31st and the 3ed and on the 3ed it said I had a 33% chance of pregnacy now that's the highest chance so does that mean I ovulated?? And why does it say I am firtle 2 time in one month in the beginning and end??