How Can Severe Constipation During Pregnancy Be Treated?

Hi there. I m 7w, 3d pregnant with my first child. I have typical digestive issues, usually in the form of diarrhea, due to gallbladder removal a few years ago and a more recent appendectomy seemed to only make those symptoms worse. I haven t had a bowel movement in over a week and now cannot, despite the urge. I ve been trying for hours over the past few days, but only pass small amounts of liquid matter, no hard stool. There is a decent amount of blood mixed in. I ve tried Milk of Magnesia and Glycerin suppositories as suggested by my doctor with no relief. What can I do?