Sometimes a big glass of OJ will cause a 'dumping' which will help push things through.
Someone mentioned dried apricots, but there are many dried fruits that will help, prunes, figs, apricots... drink a big glass of water when you are eating them too.
there is a product called Nulax which is a combination of dried fruit that helps you go, it is made mainly of figs, so i would just buy figs and eat them.

Also someone mentioned warm water - try adding a squeeze of lemon juice and have this first thing in the morning - a great cleanser and the warm water gets things going

goodluck, its awful, i suffered badly in my last trimester, at one stage i thought that i would literally push MJ out !!