Chemical after blazing positive?

I'm just anxious so sorry in advance.

Today is the day AF should have come but she's not. I've had 3 days of dark, solid positive tests. I had it confirmed by bloodwork too. But my doctor would only call out follow-up blood tests a week later as opposed to 48 hours later, so I just keep taking HPTs in the meantime. It seems like the lines are getting a little more faint.

Has anyone had a strong positive and it turned out to be a chemical anyway? I've had so many chemicals, my heart can't take another. 💔