My constipation problem has gotten worse during pregnancy. Please help.

Hello doctor,

I am 20 years old, and currently, I am pregnant. I have had constipation issues since birth, but with pregnancy, it has got worsen. In the beginning, I go every few days, but it will be super uncomfortable if it was more than three days. I have a super bloated, sick feeling. So I would do an occasional enema and milk of magnesia. But as the pregnancy progressed and constipation got worse, it stopped working. I was told to do stool softeners and Miralax. It just gets pretty bloated, and I have to use an enema. Eventually, I stopped being able to go on my own. Now for the past few weeks, I have had liquid stools. The doctor says it is not diarrhea because I am not going multiple times a day and having spasms. I can only get it out with the enema. So they thought it was a fecal impaction. They had me do a colonoscopy preparation to try to cleanse me out. I had bad gurgles and a distended stomach but still could not go on my own. When I did the enema, it cleared out some harder stools, and the rest was liquid. But I am scared that was not the only problem. They cannot do imaging on me because of the baby, but they said they could not rule out colon cancer. I have not had any bleeding, my laboratory work looks good, and pain subsides once I go to the bathroom. But I still will get lower abdominal tenderness to touch off and on.