Chemical?

So sad to even have to ask this question... but hoping for some insight. How did you guys know when you had a chemical?

I’m about 12dpo currently. On 5dpo, I started spotting. Looked normal.. very light, brownish color. The spotting was very minimal from 5dpo-10dpo. I started taking tests at 8dpo. I got a vvfl everyday from 8dpo-11dpo (4 tests). I also took a digital but it said negative. I thought that was normal though because I was only 11dpo.

Last night, I wiped and there was a very small blood clot on the tp. The clot was hard and about the size of a sesame seed or something. It was bright red but that was it. Nothing before or after that. I did have some AF like cramps yesterday and today though.

I took another test this morning at 12dpo and still vvfl. It doesn’t seem like the lines are getting darker, although there is always a faint line. AF is due in 2 days.

Could all 5 tests be faulty? Did I have a chemical? Is it still too early?

Has this every happened to anyone?