FTM. Contractions ?

I feel lower back pain tightening & pelvic tightening as well as my belly, they are really strong but not strong enough for me to go to the hospital because I keep thinking they should be stronger ? I’m not sure what contractions feel like but they are coming often I will start timing them in a little bit. I’m just nervous that I won’t realize when I’m having contractions.

39 weeks tomorrow