Hcg levels taking forever to drop

I’ve had the hardest week of my life this week. A&E visits and early pregnancy clinic. I would have been 7+3 weeks when I went with some spotting nearly a week before attending. They scanned me and could see nothing. It was explained to me I will be miscarrying. They drew blood and sent me on my way. Fast forward to now. This is bloods

22nd aug - 325

24th aug - 333

26th Aug - 290

28th Aug - 285

They are classing it as pregnancy of unknown location now. They need the levels to drop but in one week have only gone down 40 points in a week. I’m being closely monitored and having tests for liver and kidney functions too.

Has this happened to anyone? How long did it take? I’m exhausted with this. I fell pregnant the first month trying. I’m now worried this is going to happen again if hey ever drop low enough for me and husband to try again. Thanks for your input 😥