Question mid cycle bleeding

Sa
So I got my period 11 days late this month. It was normal. Then 6 days after it stopped I randomly got cramps and had a heavy period with clotting. The next day( today) I have very light spotting.  Before bc and after I stopped taking it almost 2 yrs ago I had very irregular pds my dr put me on thyroid meds about 4 months ago and things became pretty regular until now. I have a follow up appt on 6/23 but I was just wondering if anyone else had a similar experience so I can ask my dr the right questions. 
Thank you.