Aih, constipation memang susah bila pregnant or nursing, few of my mum friends kena jugak, sangat uncomfortable! First thing, try increase fibre and water intake dulu, makan more fruits especially prunes or papaya, and jangan lupa walk around sikit. If still tak okay, better check with your doctor or midwife because certain medications are safe for pregnancy/breastfeeding tapi some aren't, so tanya je dia yang tahu status you sekarang.