Well, I took 3 tests and they were all...

POSITIVE!

The only thing is that they were all really faint lines (all exactly the same). I took 2 last night and 1 again this morning and no change. I'm expecting AF either today or tomorrow, so I guess it's really early (today is 12 days past ovulation). I was cramping all day yesterday, which made me a little suspicious because I never cramp the day before AF. Also - on Sunday I was so tired that I literally couldn't keep my eyes open. I guess I didn't connect the dots because I didn't want to get my hopes up. I guess I am still cautiously optimistic due to the very faint line and the fact that I feel that AF is coming at any minute!