HCG not doubling after 72 hours

So I'm 5 wks and 5 days. I had HCG quants done on Friday (5w1d) and Monday (5w4d). My first level was 1735 and my second was 2234. We are leaving to go home for the holidays today and we had planned to announce. Now I'm not so sure. I go in for a ultrasound on the 29th now and I'm an absolute mess. That gives me a doubling time of like 8 days. 
I guess I just need to write this somewhere.