36 weeks and brown discharge

K

Just went to the bathroom and noticed a bit of brownish pink discharge when wiping. I’m 36 weeks exactly today. Could this be my mucus plug? I never lost it with my first son or at least that I noticed, so I’m not sure what to look for or compare it to. It was just mainly on one wipe, wiped a second time and it was basically gone. Should I be concerned and call my doc or wait to see if it happens again?