Ball like feeling in lower abdomen.. Advice?

Kayla • 21 years old. Got diagnosed with endometriosis at age 20. Wanting to conceive my first child.
I'm very confused I've had red and brown colored spotting since the 14th of this month. Last night I was sleeping on my stomach and had ball like feeling in my lower abdomen. I don't know what it could be. And today my lower abdomen has been very hard and bloated. Can anyone give me any sort of insight of what this could be?