Braxton Hicks at 27 weeks

Has any mommy experienced Braxton Hicks before 3rd trimester? Kinda worried if I'll get preterm labour. I've been feeling it since a month ago (since abt 24 weeks). Feels very early to have this right now at 27 gg to 28 weeks cz for my 1st pregnancy, I only felt it aft 33 or 34 weeks and I dont rmbr it to feel this tight with some back pain. Now at 27 weeks, I'm getting more of it, not regular. Consulted my doctor and he prescribed me a medicine to reduce contractions and explained to us abt the risk of preterm labour. I just went for my glucose test, not sure of the results yet. Scared I'll have GD too cz tt will also increase my risk of preterm birth.