talk to ur doctor & see if there is anything she/he can perscribe to help u or anything over the counter
Have your doctor prescribe you stool softeners. In the meantime drink lots and lots of water and drink a cup of coffee too if you have some, you can have one caffeinated cup a day. That really saved me during my last pregnancy when I'd get constipated all the time. It might also help to switch from your prenatals to a daily vitamin without iron and a folic acid supplement.
I really hope you feel better soon!