5 weeks 2 days & spotting

I found out I am pregnant after my third IUI. I am 5weeks 2 days today. I had two HCG checks and my numbers were doubling. Yesterday I wiped and had light pink spotting on my TP. Later when I’d check & wipe instead of it being clear it was brown tinged. No pain/cramping.

I have my first ultrasound tomorrow afternoon. I’m so very sad and scared because I miscarried last September around this time and it started with brown spotting which got worse & turned into severe cramping/bleeding w/blood clots.

Has anyone experienced light spotting in early pregnancy and all was okay?