Help! Pregnant and constipated!?

I am 8 weeks pregnant. I am drinking tons of water and prune juice, eating fruits and vegetables, taking colace stool softners and nothing is helping...I feel miserable..too constipated to eat...and bloated. This is my first experience with this..ugh..Can I use a glycerin suppository? I have read that some doctors say it is safe while others say they are not. Suggestions?