Preterm labor?

Idk if this is the start of preterm labor or just a sign of baby preparing for labor, but since yesterday I’ve had lower back pain (new symptom), LOTS of pelvic pressure that doesn’t go away with switching positions or going to the bathroom, lots of pooping and cervical mucus (tmi), and shortness of breath. I know she’s definitely sitting lower than before, which is why I have more pelvic pressure. I’m 34+4. Should I go get checked? Or is this normal? Also I don’t go to my Ob until next Friday