Hi I am going on holiday tomorrow and my period is due I last had it on 15 to 20 December and before that 10 to 15 November so my calendar says my period is due 19th Jan. I be back from my holiday 17th Jan. I want to swim and enjoy the spa and cannot whilst on my period. I have a prescription of micronor I took 2 years ago and it's still valid and doesn't expire yet. Will this stop it from coming? Thank you