During pregnancy some hormones will be slowing down your digestive system, in an attempt to give the body more time to pull nutrients from the food you eat so you and the baby can be fed. This can also dry out the waste, and cause it to back up in the system leading you to need constipation relief during pregnancy.

Physical Changes, there are also physical changes taking place in the body. The uterus is changing its shape, and many parts of the body are shifting around inside to handle a growing baby that will be held in the womb for the next nine months. These changes can lead to a number of problems like constipation because there will be pressure put on the intestines that can make it harder for waste to move through the body.