Spotting and dates are way off

I should be about 10 and a half weeks according to my last period. However, I had an internal ultrasound Monday saying that I was measuring 6 weeks and to come back in two weeks. If there’s a heartbeat, it’s likely a viable pregnancy and my dates are just off. If not, likely a missed miscarriage.

The day after my internal us I woke up to what looked like blood in my underwear. Since then, I have had intermittent pink and brown spotting. Sometimes it shows on my pantiliner and sometimes just when I wipe. No cramping.

Anyone had a similar experience? Did you miscarry or did it result in a normal pregnancy? I know some spotting is normal but based on the results of my ultrasound I’m trying to come to terms with the fact that it’s probably a miscarriage.