Contractions

Have any of you mamas not felt contractions with one pregnancy, and felt them with another? I went in for an elective induction with my first at 39 weeks, and my contractions were already 3 minutes apart, and I did not feel them at all, and I didn’t the whole time I was in labor. I am not 25 weeks and feeling tightening in my stomach, so I am wondering if that may be Braxton Hicks and I may feel them this time. I have a fear that I may birth my baby on the toilet because I won’t know I’m in labor lol