I'm sorry Hun but I knew it
same thing happenned to me. Btw my last mc was at 8+3 so I wasn't that far along and the stupid hcg lingered for well over 10 weeks. I freaked and went for bloods etc and it eventually went down slowly. I too was worried but it can be very normal sometimes, our bodies just take longer. I also had 2 periods in between. It's a good thing that the test is negative so that now you know and next month if u see a line you'll know for sure it's a new pregnancy
wishing you all the luck, you'll have your rainbow soon xx