this is my first baby and I have no idea what's going on, the doctor told me yesterday that I'm…

this is my first baby and I have no idea what's going on, the doctor told me yesterday that I'm thinned out and 2 cm dilated and that she can feel the baby's head. I been feeling light to medium cramps and pain under my waist area. she said if they become stronger I need to go to labor and delivery. what to do ???