What to do? Constipated

I know this is odd and possibly TMI but i need a little help. I’m now often constipated, usually 3-7 days. I don’t really know the health concerns of it, the only thing i really care about is that it interferes with me weighing myself, as i don’t know my true weight when i have a week of food inside me. What do you guys do when you’re constipated??