The bleeding can be a result of the hormonal imbalance that is triggered by the pills. The side effects you are experiencing are also common. One must keep an eye on the bleeding and at the same time drink enough water. If the bleeding continues or worsens, it is important to get medical help from a gynecologist to ensure everything is fine.

Judging by your levels of Vitamin B12 and Vitamin D, it appears that they are low. Low B12 can be a reason for feeling tired and weak. Low Vitamin D can be a reason for bone pain and muscle weakness. You may need to get B12 and Vitamin D supplements. Besides, it's good to consume foods that are rich in these vitamins like fish, eggs, and dairy products.