Dr is not sure if I’m miss carrying

I’m EARLY - 4 weeks and 4 days

I’ve had bleeding, def not enough to fill a pad but enough to where I wipe and it’s there. It’s varied from light pink, to brown to a mixture of dark brown and dark red.... this has been on and off for 5 days. My pregnancy test are getting darker.

My dr asked me to test in two weeks (12/23) and if it’s positive I need to go in for an ultrasound- if it’s negative then obviously I missed carried.

I know we’re not dr but has this happened to anyone else?