Progesterone users ...

So my husband and I have been trying for #3 for quite some time. I’ve had issues with miscarriage at 5/6 weeks. I was prescribed progesterone in Nov 2018 and I began taking it during my early cycle - from that moment on, I haven’t gotten a pos preg test ever again. I’ve been told it can act as a birth control to some. Well, I took a few months off and we tried again in August. I am due to get my period on Thurs ... on Sat I began taking progesterone to hopefully support a pregnancy and delay early bleeding. I started spotting on Monday very slightly. Today I was spotting too, but not enough to fill a pad - just when I wipe or go to bathroom. Its sometimes brown but also more pinkish. In past months, at this point, I’ve stopped progesterone (which I know will bring on a period). But now I am thinking ... I don’t have terrible cramping and I’m not gushing blood - could this be implantation and I should test on Thursday/Fri and continue my progesterone 2x a day to be safe? Any thoughts? I’m hanging on to a miracle I know