even before i was UTD i used to get badly consitpated. I used to use microlax then when it got really bad. Hopefully you can just use it once, and it is enough to get you going and get the initial "lump" lol out and after that something more natural can keep you going. They are gross to use (i am assuming it is a suppositry?) but seriously you will go within halfa tops! - probably quicker!

good luck hun, let us know how you go!