Weird Cycle?

So when I was about 16, I got the Implanon. For a little over a year and a half, I had a sort of reverse menstration cycle. So to go further into that, I would have a couple days off in a month that I didn't have a period. The rest of the month, I bled... I recently got the implanon removed to see if it would make a difference and am now on the pill. There is a difference, but it happens for a couple days every couple weeks or whenever I have sex. Does this happen to anyone else?? I have gone to the doctor multiple times about this problem and nothing seems to be working. Is this just me??