Line disappeared

Got a faint positive Friday, Sunday it got a little darker, Tuesday it was faint again. Today (Wednesday) it’s pretty much gone. I know this probably indicates a chemical pregnancy.. i had one In September. I did blood work yesterday so waiting to see what it shows. What I’m wondering is why did it happens twice in a row? Has anyone experienced this before ? What are you experiences? I’m ready to give up, I feel like my body is failing me.