With my first, I ate loads of prunes and drank fibogel. But honestly, what's helped the most is just having a massive bowl of porridge every morning with all sorts of nuts, dried fruit, chia seeds, etc. in it. I've eaten it pretty much every morning since 2nd tri and my constipation has completely gone away and I've felt so much more comfortable this time. I don't know if that's what's done it, but it certainly hasn't hurt. It has to be real porridge though, like the proper rolled oats kind, not the fine ground or microwave packets.