Bfp to bfn- accumed

Hi all. I am 7dp5dt today. I had definite implantation bleeding yesterday evening. I’ve never had anything like it. It was extremely light, pink, kind of like tissue. Anyway.

I tested out the trigger shot last week. Even though it was a FET, we did a natural cycle due to my issues and triggered for ovulation then transferred five days after ovulation.

Yesterday, after that bleeding, I had an obvious bfp on accumed. I used to use these with past pregnancies (all ending in miscarriage) and haven’t had many issues. Then today, they’re showing negative. ☹️ I went out and bought a FRER and MAY see the tiniest hint of a line, but can’t be sure. My RE allowed me to do bloodwork today, earlier than usual. I haven’t gotten results but even despite that, I’m scared I could be having a chemical. 😢

Anyone else have similar experiences and/or issues with the accumed test?

Thanks! ❤️❤️

Maggie