Oh dear, I understand how stressful that can be, sembelit memang sangat tak selesa, especially masa pregnant. Most iron supplements do cause constipation to some degree, so you are not alone in this. A friend of mine had the same issue with Zincofer and her doctor actually switched her to a different formulation, and it helped quite a bit. What many mums find helpful is taking it at night before bed, and making sure to eat plenty of fruits and vegetables to help things move along. That said, since your HB is also a concern, it is really best to speak with your own doctor so they can find the right supplement that works for both your levels and your comfort, they know your full history better than anyone.