I had that same problem being pregnant. I had to take my multi and 2 extra iron tabs a day. I took the iron with food and a ton of water. Make sure you drink plenty of fluids. Also it helped to add more dark greens and grains to my diet. I drank a fiber drink every morning to help as well. I think the fluids helped the most though. I never took laxatives, I did have to do less harsh ways like enema (sounds gross but it works very well). Hope that helps some. Any questions feel free to ask