Medical doctors at Mulago Hospital Kampala say that during pregnancy, the placenta produces hormones to sustain your pregnancy.
These hormones make your cells more resistant to insulin. As your placenta grows larger in the second and third trimesters, it secretes more of these hormones making it even harder for insulin to do its job in your body.
Your pancreas responds by producing enough extra insulin to overcome this resistance. But sometimes your pancreas can not keep up.
When this happens, too little glucose gets into your body cells and much of it stays in your blood.