Mucus plug??

Jessica • 2 beautiful girls and 2 long awaited twin boys 💙💙❤️❤️ I’m finally a mom of both 🥰

I was just in the hospital for almost 3 days due to contractions, dilation and preterm labor as I’m 31 weeks with twins. I just noticed this in my underwear. It’s mucus and it’s tinged. Please let me know if this is part of my mucus plug