Just BHC or preterm labor?

Okay, so a little background first, I am 34 1/2 weeks pregnant for the 3rd time, but only 2nd child. For the past 2 weeks I have been having an INSANE amount of pelvic pressure, called the doctor last Monday she said try Tylenol, more water, and bed rest. Did that for 2 days still didn't help, I called back she told me to go in, so I did. I was 10 % effaced and the outside of my cervix was one but inside still closed. Also I was told I was contracting every 8-10 minutes but I wasn't feeling a thing other than the pressure until this past Sunday when I was having contractions every 10 minutes but found no reason to time them since I was told no need to return to L&D unless they were every 5 minutes or less. So I blew it off. Went for my regular check up on this past Tuesday and was yelled at by my doctor for not going in Sunday. And she said if I have anymore 10 minutes apart or less to go in. Well it's the middle of the night but for the past 18 hours this crazy intense pressure is back and today accompanied by yet again more contractions. I timed them for 1 1/2 hours and had 14 contractions. They are SUPER irregular though not like they were on Sunday. For example 4 minutes, and it lasted 12 seconds, then 9:30 minutes and it lasted 19 seconds. Anywhere from every 4-10 minutes lasting from 8-23 seconds. It is also accompanied but a low dull backache. Just wondering if I should go back to bed and try to sleep it off or go on into the hospital?!? Thanks in Advance!