I didn't realize I was in labor, either. I had even been to my OB at 10am and was dilated to only 1. By 8pm I was wondering if the pains I was feeling were indigestion...LOL. Went to the hospital at 10:30pm, was dilated to 8 with a bulging bag and had baby a couple of hours later. By the time I got to the hospital, I was in active labor and I knew, but did not know before. I had been cranky all day & having tightening for a couple of days before, including that day. I tried the warm bath that night and it didn't stop the pains, so that's when I knew to go to the hospital. Good luck, OP.
Happily married, WAHM of C (15), M (3), and E (1). Expecting a very big surprise baby on 3/25/14.