Possible miscarriage coming...help

Ka

So I had a fresh 3 day transfer on May 28th, and I had beta testing on Monday June 8th.

My hcg was only at 6.5. They told me that was not good would likely end with miscarriage or ectopic pregnancy. I’ve been in for two more beta tests since and my hcg has almost doubled both times.

As of yesterday, Friday June 12th, it was at 21.5. I go back in Monday but they keep telling me not to get my hopes up and prepare for the worst....has anyone else had this happen? Is there any chance that this could turn out ok???? I’m heartbroken right now. 😔

Edit: It went from 6.05, to 11.5, to 21.7 all from June 8th to June 12th.