Worried I won’t know I’m in labor

I really don’t think I’ve had any Braxton Hicks based on how people describe them.

I’ve had tightening in my abdomen when I’ve been up a long time or just done too much during the day. It lasts until I sit down and rest for a while. It doesn’t come and go.

I’m terrified I won’t know I’m having contractions when the time comes. Anyone else?