When did your hcg tests go negative with a chemical?

I was supposed to be 3 weeks 5 days, today but woke up, went pee, took a frer pregnancy test (line got a little lighter) and a pregmate cheapie (line got darker) (7hr hold)

and then I wiped and noticed bleeding...it was lighter this morning but now it’s heavy and my cramps are strong!

Just took another cheapie pregmate this evening (like a 10min hold) and line’s still showing same darkness as this morning maybe even a tad darker even though I’m cramping and bleeding strongly.

How long does it take the test to go negative with a chemical?

Tests below from today - morning top/evening bottom; cheapie