I think you should wait, bleeding doesnt always mean ur miscarrying, i know women who bleed two months in a row and still be pregnant, wait for a full 54 days, thats a cycle and a half. If still no higher hcgs, then decide.
I think you should do what feels best to you. If you have any doubts then just put it off. Sorry you are going thru this right now.
its totally up to you, I personally would wait another 2 wks if you can and then see whats going on, you may start to bleed again, and miscarry naturally, I am always very hesitant to say go the d&c route until levels have stopped rising or are starting to drop, if you decide to wait the two weeks I would also expect them to confirm things like a miscarriage etc by more bloods and a follow-up u/s