How urgent is spotting at 6.5weeks?

I see a lot a people saying spotting at this stage is normal but let your doctor know to be on the safe side. I started spotting for the first time today but it’s a holiday weekend so the doctor won’t be there until Tuesday. At this point it’s light brown and only when I wipe. I’m having some mild cramps but that’s been going on the whole time. My first ultrasound is in 1 week and 1 day.

Should I wait til Tuesday to call the doc?

Visit a walk in or ER? At what point should I worry? Or is this no big deal?

Any advice?

UPDATE: thankfully the doctor is open today, and they put me in for a 1:15 appointment. Still light brown spotting with light cramps.