I tried effing EVERYTHING when I was pg and nothing worked. So I keep meaning to post this, but the secret is.... Grape Nuts. Bizarre name - not grapes, not nuts, but you'll find it in the cereal aisle in a small box, usually hidden at the bottom of the shelving. Really high in fibre and the bonus is high in iron and folic acid. It's a bit crunchy, so leave it to stand with milk for a while. Good with a chopped banana or blueberries. And much better tasting than Bran Flakes or (heave) All Bran.. Worked a treat and I still eat it now,three years on.