Brown Spotting

I’m 15w2d and tonight when I went to the bathroom I noticed light brown discharge when wiping. I haven’t had any again since and I have no cramping. I’ve had no complications at all with this pregnancy. my last ultrasound was 3 weeks ago and everything looked great. I feel bad calling and bothering my OB over brown discharge that has happened once. I also have an appointment this Friday.

Has anyone experienced this before? I have a MMC with my first baby at 7 weeks, so I’m always a bit on edge with this pregnancy. Thanks in advance.