Is it possible to have a growth spurt three years after starting your period and not growing in the past year?

While it is possible to have a growth spurt at any time, including three years after starting your period, it is unlikely to have significant growth if you have not grown in the past year. Most individuals reach their peak height by their late teens or early twenties. If you are concerned about your growth, it is best to consult a healthcare professional, such as a doctor or endocrinologist, who can assess your growth patterns and determine if further investigation is necessary.