What can i expect during the first month of taking the birth control pill?

Most have none: Most women who take birth control pills have no side effects.Most common side effect in the few months is irregular bleeding that gets better over time. Possible side effects include breast tenderness, nausea, mood changes, headaches. One serious potential risk, altho rare, is an increased risk of blood clots in your legs or traveling to your lungs. Smoker >35 shouldn't take pills.Ask yr dr.