Don't worry. Keep pairing them, that is whats really important. Tail wagging is just the excitement of the female and her advertisement to the male that she is going to be receptive. He may or may not show interest. I don't know for sure if tail wagging has any indication or information about ovulation. In any event , if she has ovulated or not it will not hurt to pair the male with her. Make sure you are giving the male rest every 3rd day! Good luck.