I'm so lost with OPK's it's ridiculous!

Hannah • -Jeremiah 29:11- Hairstylist Expecting baby #2 dec-2015!
I'm on the third day of my three day late period,  I decided this month to take OPK's while on it because it feels like in months pass I can never know when I ovulate exactly. And this is what I got...2 faint negatives and then an almost  ositive? If I'm ovulating while on my period how does that work? Ugh I'm so lost.... Any insight please! I have 29-30 day cycles.