BFP then BFN?

Bailey • Lucky wife 💍 Fur momma to five 🐶🐱🐱🐱🐱 Angel momma to three 👼👼👼

I got a vvvvv faint positive on First Response Rapid Response yesterday morning (5am) at 12dpo. I took the other rapid response at 6pm the same night and got a slightly darker but still faint positive. I took a First Response Early Response this morning (6am) at 13dpo and it was completely negative. I took the second early response 2 hours later (8am) and I can see a vvvvvv faint positive, fainter than the very first rapid response. I had a miscarriage last month that started with tests that didn’t darken and ultimately found out my hcg wasn’t going up like it was supposed to. I had a positive opk and ovulation pain on the 9th. Any ideas??? I’m terrified it’s a chemical.