Heartburn at 29 weeks is very common and uncomfortable. Please do not stop your iron completely without speaking to your doctor, as it prevents anemia. However, switching to an alternate-day iron regimen is often a safe, effective way to reduce stomach upset and can even improve iron absorption. If you make this change, remember to take your iron and calcium supplements at least two hours apart, as calcium can block iron absorption. Your doctor can check your blood levels to ensure this schedule works for you.