Did I stop growing and ways to maintain my height....?

There is no hard and fast rule about stopping growing after your period starts. You could still grow, since you are only 15. Then again, you may not.

Either way, you have no control over it, so be content with whatever height you do achieve.

Best wishes!

You won't grow more than an inch. Girls finish the height growth stage of puberty really early at around the age of 14 to 15, and the year leading up to that time will only see about an inch of growth at best (assuming a freak event doesn't happen and you get a growth spurt).

If you haven't grown in the past two years your major growth spurts are over. You might grow a little bit taller but I doubt it will be more than a few cms. Exercise shouldn't affect your height at all.