8 Weeks, things not looking good

So this is a bit of a long one and in my gut I know the answer but would be keen to hear others experience. The last 3 weeks have been hell!!

So I tested the day after my period was due as I had'the feeling'. Got a positive so knew from very early on.

The following week I thought i'd go to my doctor too confirm and see what the next steps were. She confirmed with urine test and swn me for bloods.

First blood came back with HCG at 450 and while positive she felt they were a bit low. Sent me for another lot three days later and they had dropped to 430 (-20). From there I started preparing myself for a m/c. My next blood test showed 2500 filled by 6300 filled by 15000 and finally 23700. I know there is definitely times where hcg can continue to rise for a bit after a m/c but this seemed too long.

i went for u/s and what would have been 6w5d. Sac seen, nothing else. Was told not to worry and to come back in ten days. Return at 10 days and what should be 8w1d. Sac and foetal pole seen but no heartbeat. Measuring bigger but only 6w4d.
The only insight they could give me was 'it was a bit worrying'.
I have another scan scheduled next week.

It's now been over 3 weeks since my initial hcgdrop and every day is a constant worry about will today be the day. I'm struggling to get answers from doctors or anyone. I'm pretty realistic with my expectations so I'm not sure why they can't just be straight up with me.

Has anyone had any similar experience you'd be willing to share for some form of insight?
Driving me crazy and just really want to move on atthis point.

TIA :)