Thanks for using the forum.
Many first time mothers are concerned that they will not recognize the contractions when they start.Contractions are a tightening of the uterine muscles to help push out a baby. They often start by feeling like just that a tightening. The abdomen will feel firm and tight. Contractions related to true labor will become regular and increase in intensity as labor progresses.
I hope this helps
Cathy
When I had my first child I was nervous I wouldn't be able to recognize when I was having contractions. But you will know once they start!!