Im 37 weeks pregnant with my 4th baby. i havent had a bowel movement in a month and now im having night sweats. im also having tightening in my belly?

You need a laxative: It is not a good idea to go a month without a bowel movement, especially when you are pregnant, which obviously takes up a lot of pelvic and abdominal space already. You should take daily Metamucil with lots of water and use daily products such as Milk of Magnesium(at least a tablespoon) and Miralax(by the directions) if no results with MOM. If unsuccessful, see your OB or family doc ASAP!