I started having my period again after taking the pill for 4 years and never having them, is this normal?

It is normal for some girls to not have their period while taking certain types of birth control pills, as the hormones released can affect menstrual cycles. However, others may experience regular or irregular periods while on the pill. Many factors, including physical activity, stress, and weight loss, can also impact menstrual patterns. Since this is a new experience for you, it would be wise to closely monitor your situation and consult a doctor for a check-up to ensure everything is okay.