Constipation remedies TMI

My dad’s Family has had this problem but I never thought I was going to be affected too. I’ve been drinking prune juice and it hasn’t helped. I’m also on my period where I poop a lot and I took a laxative and it didn’t help. It’s been maybe 4 days I haven’t pooped and I’ve gained 10 lbs! TEN. I have been exercising more than ever and I don’t even eat chocolate (which makes me constipated) or anything at all. Sometimes I only eat one meal. I don’t want to drink more laxatives but I don’t know what to do.