Does this sound like a chemical?

I missed my period for a little over a week, last week. I was testing every morning that I missed my period and was getting progressive VERY faint lines the days leading up until Thursday morning, where my husband and I agreed we finally got our faint but definitely there BFP. It was pink and pretty clear. Well to our surprise 30 min later I started bleeding… I went too the hospital and had bloods later on that day and it was less than 1.. I had all the signs of a chemical with the weird cramping for the whole week, missing my period, slow but progressing lines.. but when they said it was less than 1 and they didn’t see an indication of pregnancy due to that, how could I have even had a chemical?? I’m sure my HCG would’ve been low to start as it was faint but still, could it go down that fast?

We’ve been TTC for 9 months now and we were really hoping this was it. We’re both still so sad about it and also feeling invalidated about it because if it was a chemical, it wasn’t confirmed. Any insight? 💔