STMI.... this just presented itself 20 minutes ago and i started panicking because it’s never happened with my other 3.. could this be my mucus plug? how soon could i go into labor? PLEASE HELP

trice • mommy of 4️⃣❣️ 👧🏽 10.10.10. 👦🏽 12.14.15. 👦🏾 6.6.17 👶🏽 5.21.20