I think I’m about to miscarry

Took a test on 11/15 BFP instantly, took another 11/19 BFP line a little darker. Beta on 11/15=27 and Progesterone at 6.9, dr ordered progesterone supplements started that night. 11/19, Beta=42 nurse said that is fine for early pregnancy and a normal progression. Today take One Step or whatever it’s called (online cheapie) and BFN. Me thinking this is very odd. So i go out and buy a few more test. Take the First Response about 3pm or so and can barely see the line. 😔. Early miscarriage??