A BM every 4 days is like, WOW!!!!, to me after once a week!! Every MSer is so different. I read of a person going 5 weeks without!. I've read 2x a week acceptable for a non-MSer (though I was once an every dayer) I get no bloat, weight gain, etc. - so see no problems. See a doctor, discuss it. I keep an eye on everything I do or don't do anymore.