im 31 weeks pregnant with my first , ive ben having braxton hicks that arent really painful until today when i was walking i started to have very painful contractions , and sitting did not help. as a smoker im worried about preterm labour , when i gothomei started to try relaxing but am still having some contractions though not as painful. should i go to the hospital and get checked or does this sound like normal braxton hicks ? ive also had some pelvic pressure but not sure if it means anything