Confusing Period!!

Ok, so my periods are usually like clockwork (maybe a few days out here and there) but mostly a 28 days cycle.

But this cycle I've had 3 periods!! What the heck?!

From the 21-25 it was old blood..

From the 5-11 it was super heavy, bright red, thin healthy blood with no clots..

And from 17-present day, it's dark red, thick, with clots..

When I started bleeding the second time, I went to the doctor because it was abnormal for me, I got blood work done, and they sent me home saying nothing was wrong, it was probably just a hormonal imbalance.. However, now that I'm bleeding again, I'm like "???" "Really?? Hormonal??"..

Has anyone else experienced this and it turn out to be fine? Or should I be pursuing the doctors for more info?

I'd love any feedback!