HCG tripled.. then didn’t


Just trying to see if anyone had a similar experience?

12 dpo- 10

14 dpo- 30

17 dpo- 34

My doctor is concerned that my numbers aren’t doubling.. I’ve had three previous losses. I’ve never made it this far in pregnancy.. I’m nervous about an ectopic pregnancy and of course another miscarriage. I go in tomorrow for repeat labs and to talk about where to go from here. Anyone have any similar experiences?