is it possible that my doctor could be wrong about my due date? I don't think I'm going to make it…

is it possible that my doctor could be wrong about my due date? I don't think I'm going to make it to 40 weeks. I think he is going to come in about 4 or 5 weeks. he's so hard to carry at this point and I move so much...I think both baby and I know that this situation cant last much longer lol