pregnant and sore lower belly

okay girls so based on my last period my due date should be oct 11th but since my baby was measuring a 3weeks smaller whenever i had my sonogram they moved my due date to oct 31st but this week i started having a sore lower belly, like any movement i make i can feel the soreness and i also get cramps here and there but they arent too strong and my pelvic bones are really sore as well (i think thats what they are called im sorry!) could this be a sign that ill be going into labor soon? this is my second baby by the way