Possible trigger. Low hcg but still rising?

Hi Ladies. I'm 6w2d according to my LMP. I have been spotting since I found out at the ob on the 15th. We lost a baby at 6 weeks back on May 24, 2019...so,we're roughly two months apart from it. 

I am scared to death. They've used the word abnormal more than once. I've been told that I'm in the "Grey area" and we just have to wait. 

Got my levels back from today's blood draw and it's still going up, but not doubling... What is going on with me?! This anxiety is literally going to be the death of me 😭😭😭

Here's my levels:

17th -353.9 || 5w1d||22dpo

19th -465 || 5w3d || 24dpo

22nd -599.1 || 5w6d || 28dpo

24th - 903.8 ||6w2d||30dpo