Could I be going into labor and not know it?

So I am 36 weeks and 2 days my doctor said I’m likely not to make it full term. At 32 weeks I went into preterm labor, but was able to slow my contractions down enough so they could send me home after a week of being in the hospital. I am now on bed rest and in the past week (give or take) I’ve been having the same cramps and pretty bad back aces and a lot more pelvic pain. When I went into the hospital the first time I did loose my mucus plug and only dialed to a 1/2 cm. I don’t want to over exaggerate how I feel and go to the hospital for nothing you know? Anyways I’ve had a huge bolt of energy today but still all the pain so I don’t know what to think. I know you can be in labor and (1) not dilate (2) your water not break and (3) not have contractions so I’m freaking myself out. I have an appointment on Thursday should I wait and tell my doctor or...?