If you are six months pregnant and have sudden stomach pain, you need to pay attention to the severity of the stomach pain. If the pain is serious and there is obvious tightness and hardness, it is considered to be a miscarriage, so you should seek medical attention and have an ultrasound examination to determine the situation. If miscarriage is confirmed, the condition should be controlled with birth control medication in time to avoid miscarriage. If the pain in the stomach is not particularly obvious, try to relax, rest in bed and observe the pain in the stomach. The pain will disappear after rest and will not affect the fetus.