Labor close??

Sa

Had my first daughter at 37 weeks exactly. Now I am 36+4 with my second. I got checked today at my appointment because I’m having contractions and she said I was soft and 3cm dilated. She said at this point to go to the hospital when contractions are 10 minutes apart for one hour. I don’t really feel the actual contractions I mainly feel the back pain and the back pain is getting more consistent now. How long do y’all think until labor starts?