Abnormal rising hcg levels

So it seems like my journey is getting toward this end for the last week my HCG levels have not been doubling every 48 Hours like they're supposed to they race but they don't double I've had two ultrasounds that confirm it is not ectopic pregnancy i still have my pregnancy symptoms im not bleeding spotting or cramping my recent ultrasound shows a 5mm gestational sac but no yolk sac or evidence of fetal pole for now they are not confident in trying to terminate the pregnancy because it's only my HCG levels that are not normal my ultrasounds are all normal for being how far along I am but I'm getting pretty discouraged and worried anybody have any advice or stories similar to this that could help calm my nerves I could really use it right now I don't have much of a support team it's just me and my doctors