What is severe uterine irritability?

Hey mamas! I’m 37 weeks today and went in for my apt this morning. They did an NST bc I was tachycardia and wanted to check baby. She’s moving great but contraction monitor showed a lot of activity. Doc said severe uterine irritability.. what exactly does this mean! I’m about 1.5cm dilated and 90% effaced! I’m so uncomfortable I just want this baby to come soon!