What are contractions?

Okay so its been 5 years since i had my son, im currently 36 wks pregnant with my rainbow. And i have absolutely forgotten what contractions feel like or how to time them. I had mostly back labor with my son and little to no pain at all I got extremely lucky with him. I am feeling a burning sensation and tons of pressure was at l&d 2 days ago being monitored i guess i was contracting vut wasnt feeling anything im 2/5ths engaged 95 % effaced and 1.5 cm dilated. Please help im so confused on when this baby could come.