The increase of estrogen in the body after pregnancy will lead to water and sodium retention, so you will feel a lack of strength in your whole body. In addition, due to the increase of progesterone, the smooth muscle is in a relaxed state, so you will also feel no strength. In this case, it is recommended that you can eat more fruits and take vitamins, and it is recommended to strengthen nutrition and protein, which will gradually improve this symptom of no strength. If it is due to the serious early pregnancy reaction when you are just pregnant, you can’t eat, causing the electrolyte disorder in your body, so you will also show the symptoms of lack of strength clinically, it is recommended to go to the hospital for rehydration treatment to correct the electrolyte disorder.