Is an 8mm thick endometrium diagnosed as hyperplasia?

Sophie • Baby 2 on the way

I had an 8mm thick endometrium on day 3 of my cycle.I have had very heavy bleeding last 2 cycles!.My gynae told me i have a thick endometrium and will have to do a D &C;? Is this too thick and is a D&C; necessary?Help please!!Will this affect my fertility? I am ttc