Probiotics during pregnancy helps in promotion of healthy gastrointestinal functioning which in turn prevents constipation. Constipation is one of the common side effects of pregnancy that can be controlled by eating fresh yogurt or by having yogurt drinks. The reason is that they contain probiotics inside with live and active cultures of good bacteria. When you are purchasing yogurt, do look into label for live and active cultures of bacteria otherwise they are of no use. Thus, probiotics and pregnancy share a healthy relation and can safely be used during pregnancy.