Positive OPK 2 times in a month???

Je
I got a positive OPK earlier this month on 6/14, but yesterday I started to get the normal stabby feeling I get when I O, so I tested just out of curiosity. Well, the line was there but not quite dark enough to be a positive, so I decided to test again today and it's definitely positive. Does that mean I O'd twice in a cycle? Or did my body just gear up for it and then it didn't happen? DF and I quickly BD'd in case the OPK I got earlier this month was false, but I'm very very confused. Anyone else have this issue?