i was 4 cm dilated on the 25th. my ob wanted to do a sweep but it hurt too much to do so. im now past my due date, but im still only getting braxton hicks contractions. granted, more often, like every hour to two hours. but i can walk through them. i have had a perfectly normal pregnancy, with the only mild concern of placenta previa that was less than 2 cm low until i was 6 months along. should i be concerned?