Will Taking Primolout Be Safe For Preponement Of Menstrual Cycle?

hiii, i got my period on 29 of november, but i have to travel on 22 of january 2012, and i want to try to conceive with my husband during this time, so i went to my doctor and asked her how to have my period before the 22 of january, so he suggested to start taking 3 pills of primlout Nor 5 mg from tomorrrow to 5 days, is it ok? i am so confused if i take this medicine or not?