Having more than 1 AF a month?

Hey ladies, I have been experiencing weird happenings...I'm having 1/2/3 periods a month, sometimes it's just spotting, other times it's heavier. I've had lots of tests and they have come back FINE, I'm trying to track my ovulation also, but this is proving difficult as I have no idea how long my cycles are, or know when to actually test! Anyone else have the same problem? I feel alien to anyone I know and it's really starting to get to me because we are wanting a baby so so much