Help!

Karen

My cycle is 33/35 days. I’ve been off BC for over 8 months now. So I’m happy for on time periods BUT....the blood is brown and dark. And lasts only a few days. Once back on March an ovulation test was positive. But this month (July) I tested a lot and it wasn’t. :-( sad face. Has anyone had this? What did doctor say etc? Am I not ovulating do I have low progesterone? Oh and I’m 35. No STD’s no cancer. No family history of any problems. Thanks!