Early Labor ? Or just another annoying symptom?

For the past couple hours I've been trying to sleep but I can't due to sudden increased pelvic pressure, lower back pain (that sometimes feels like a contraction causing more pain), and Braxton hicks . I've tried laying on my left side with pillows and everything but the pain is too much. The only relief I can get is from sitting in a warm bath. Could this be a sign of early labor?  I'm currently 39 weeks