Hi Doctor. Me and my girlfriend has planned to go on a trip on December 25th. As per her menstrual cycle, she is likely to be on her period on 25th. Is there any pills or medication to delay her periods? We are planning for an adventurous trip, which might be difficult if she is on her peiods. If delaying periods is possible, what are the best methods to do so and what can be the possible side effects. She is 19 years old, 50 kg weight and 5'3" height.