Ovulate twice in one week?

Tricia
Okay, so I had a mc in late July and my period has been a little wonky ever since. To combat that I've been using an OPK test and found that I may be ovulating twice in one week??! I am using Clear Blue advance; AF ended on the 2nd, so I started to test on the third and got a no. Then I tested on the 4th, due to a migraine, and got a solid smiley (peak). Then test again last night, bc i thought it was strange, and got a nope again. Tested again this morning, bc of another migraine, and got a flashing smiley (high fertility). I am sitting here going WTF?!?! Has anyone ever experienced this before? Am I using this wrong? Any help or advice would be much appreciated!! TIA