Anyone else having contractions

I’m 38 weeks in a couple of days and having contractions over the past 3-4 days that start and stop throughout the day and night. It’s extremely uncomfortable and makes me think I am going into labor only for them to slow down and eventually stop after a few hours. I also have extreme pelvic pressure, worse than before. I also am now getting awful sciatic pain through my back and legs. At my last check I was 1 cm dilated and 50% effaced, but i feel like these contractions must be making some progress because they are pretty intense. Anyone else getting these?