Why am I bleeding so much

Chazette

Hello everyone I really need some help. I started my period Aug 5 - Aug 9 then after Aug 10 I have been bleeding and spotting here and there sometimes more than one day it’s heavy at times then mild most of the time it’s when I wipe and have sex! I am 37 and have been trying to conceive for 7 months. I’m really scared! I was diagnosed with endometriosis when I was 17yrs old but this have never ever happened to me!!! Does anyone know anything?