Contractions-how can you tell?

I am a FTM, and I am 39 weeks pregnant.

I don’t have any sign of labor at all and I am scared that maybe I won’t recognize contractions or early labour signs. I do sometimes get BH, but they happen usually after I have been walking for awhile or sitting for awhile, but even those aren’t that often.

Can you describe your contractions and some signs before you actually gone into labour?

Thanks ❤️