I need help

Marne • I am 31 years old and we have been TTC for 7 months. So far I`ve had late periods, spotty ones. Still no PPT
Okay so here is my story. I am 31 years old and have two children at the age of 9 and 7. My fiancé who is 40 and I have been ttc for six months and have been together for three years. In April we tried to conceive and I had all the pregnancy symptoms when my period was due but on the day it was due in May I got my period but it was more painful than childbirth. Felt more like a miscarriage to me.
 Anyway we tried to conceive on my ovulation day in June and I was ten days late from my period at the e d of June also had negative pregnancy tests and negative blood test I was confused. On the tenth day I began to bleed. I am now on day four of the bleeding and it has been light this whole time when I'm normally pretty heavy and throwing a lot of clots. (Now I can just wipe it away.)But this bleeding isn't that. It's just bleeding but the doctor won't see me without a BFN so idk what to do. 
If anyone can offer me any type of advice as to what is going on here I would greatly appreciate it. My period is normally spot on like clockwork and I've never been late. I just don't understand it and I still have the symptoms as if I were pregnant. Doesn't make sense to me. 
Sorry for the loooong post but I wanted to give you a full background before anyone offered any advice. I am just very confused