It is not uncommon to experience some bleeding during the first three months of starting a new birth control pill. This can happen because of changes in hormone levels, which can affect the lining of the uterus and lead to spotting. However, if the bleeding is excessively heavy, it would be a good idea to consult your doctor. It's recommended to give the pill some time to see if the bleeding decreases over the next few months. As for stomach pain, it could be caused by uterine contractions and may feel like burning or cramping. If you have further questions or concerns, don't hesitate to reach out for more information.