Ovalate on Clomid Help please!

I have no idea when I am ovulating I started testing on the 7th of this month my period was from the 3rd to about the 6th but still no egg I thought it would be yesterday or today but nothing on the opk, I was on it from the 2nd to the 6th of this month, also I conceived my son 3 years ago with my son on clomid but don't remember even testing we just have sex ever other day like we r doing now thanks for all it help!