Hi, I am a 23 year old girl. My question is quite simple. I am going on a tour for about a week. I had my last period on 22nd of march, 2014. Every months my periods come 2-4 days before the expected date. I am afraid that this time it would interfare with my journey. I wanted to ask if taking regestrone tablets would help me with this. If yes, then how should i take it? Are there any serious side effects related to its consumption? Please help.