I am on the last days of my period, yesterday it was so little I could have used a pantyliner but today I bleed a lot and got lots of clogs. What could it be? I had a removal of endometrosis before. Can it be that my endiometrosis is back?

I would book an appointment with your ob-gyn to verify what is going on.

It could have just been a wonky period, could have been an early miscarriage or just an non-implant embryo. All this is just arm chair guessing though.