I finished my 12th day of Ramadan then I travelled to India. When I reached India, it was again the 12th day of Ramadan. I therefore repeated the fast for this day (meaning I fasted twice the 12th day of Ramadan).
Will it make any difference? Will it be considered as an extra day of fast?
Can I consider it as compensation for my missed fasts due to my periods?
You did the correct thing, the ruling is to fast according to the place we are. This is not compensation for missed fasts. Nonetheless, we do hope for Allah’s rewards for this extra fasting hours.