Help with low HCG levels?

Rachel

My HCG is rising but it did not double. I'm terrified this is going to end in another miscarriage. First draw it was 18 and 48 hours it was only 26. She's still waiting on the results of my progesterone to see if I'll need supplements. We have no idea how far I am exactly because I got pregnant before my period returned and I go back Wednesday to see if my HCG is still coming up. Any success stories? I'm so worried..