Weird period?

So my period was about 4 days late the beginning of August. I started August 14, period “ended” Sunday the 18th. I stopped bleeding for one day, and ever wince I’ve had pink and brown spotting. Thursday I started really bleeding and it’s similar to a period, just doesn’t smell like period (gross I know lol) and I’m not cramping. I had pain on Thursday, but it was SHARP pains not cramps

I’ve always been regular, never had any issues. I don’t take BC or anything that would mess up my cycles. Ideas??? I have an OBGYN appt Wednesday