I had pre labour with DD2.
The only reason I decided to leave for the hossy was coz the pain was so intense I was scared.
My contractions were 30 minutes apart & I thought if I couldn't handle the pain at 30 minutes there's no way I could handle it at 5 minutes!
Anyway, we got up, got my bag & they hit me 5 minutes apart! When I got to the hossy I was 6 - 7 cm dialated already. 5.5 hours later I had her.
So really, what I thought was still pre labour was actually doing something! Alot more than I thought it was!
Maybe you could just go & get checked again? Maybe ask for a S&S I think you can take panadein forte if you like.