TMI pic 31 weeks pink spotting

Whitney 🎀
FTM 31w1d. I went to the bathroom and wiped. I looked and it was light pinkish spotting mixed with light discharge. Im not cramping at all and after wiping once I don't have anymore spotting. I did call my doctor and he said to go hospital if it continues but he's not concern. He did say if cramps happen or more spotting to go to hospital. Could this be mucous plug? Also i haven't had sex lately.