I have to take fibercon daily with my prenatal. Skip a day and oh no. Colace (a stool softener)helps just make sure you don't accidentally get peri colace (stool softener +laxative.) I also have a fiber one granola bar most days and eat plenty of green vegetables for fiber. Also drink lots of water.
My doctor told me to use colace and if that didn't help to take Miralax. Miralax was the only thing that helped me go.
Eat broccoli I heard it helps