No contractions just constant pain?

Should I go in? I've had this since yesterday afternoon. It's just constant pain in my lower stomach. I fell asleep and I guess I slept through it. Woke up and it was hurting still earlier yesterday. Now I just woke up and it hurts more than the last time I was awake. It's not like contractions that come and go. It's just constant pain at about a 3 or 4 now. I'm 36 weeks 6 days today. I didn't want to go in earlier because I didn't want to be sent home and it being a false alarm. It went away before I fell asleep, but now I just woke up and I'm in pain again. Has anyone had this happen and gone into labor? Are these contractions in a different way or something? I'd hate to wake up my husband and 10 year old, and my brother and sister in law by taking my daughter to their place over a false alarm. Especially on a school night. Part of me wants to go and part of me wants to wait and see if the pain gets worse before going.