Missed period, negative pregnancy test

Hey ladies,

I need your advice.

My period was supposed to start the 9th or 10th of this week. Ive been lightly spotting for two weeks (this week and the week before my period week). Anyway, I keep thinking its going to start, because I start cramping and spotting, but then it stops for the rest of the day. I spot a little bit every morning, and it gets heavier after exercise. But it never turns into a flow. I checked my cervix and it's sitting quite low, which usually indicates my period.

I had a negative hpt on Monday, so I scheduled an appointment with my ob, but I can't get in until the 31st.

I had a miscarriage in late July, and my cycle resumed the 9th of September.

Anyone in the same boat as me?? What's going on with my body??