Preterm labor again?

Hi ladies so ive been in preterm labor twice now and i think its happening again. I have tightening and releasing of the stomach about every 10 minutes or less im so sore because of it i feel like ive done 500 sit ups it also come with sharp pains on the sides, i have severe back pain that comes and goes, and lightning crotch that comes every minute and i cant walk its so painful as well as my hips hurt so much. Im going to take a bath to see if it eases up and i have an appt tomorrow that monitors my contractions and babys heart rate. I lost some pieces of my mucus plug wednesday and dilated one centimeter Tuesday when i was for the second time in preterm labor. What do you guys think is this happening again? I ask because when i was in preterm labor tuesday i had some of the same symptoms and ddnt even know i was in labor i thought it was regular pregnancy. Please comment nothing rude and only comments related to this topic or that are helpful.