It is very common to experience low vitamin D during pregnancy because your body's demands increase. Your supplement, Dicalis-OD, contains calcium and vitamin D3, but the dose may only be enough for maintenance rather than correcting a deficiency. Vitamin D3 is generally more effective than D2 at raising your levels. While up to 4,000 IU daily is safe during pregnancy, your obstetrician can prescribe the exact therapeutic dose you need. Your morning fatigue could also be linked to normal pregnancy changes or low iron, so please share these results with your doctor to safely tailor your care.