Is Primolut, Safe For Postponing Periods?

I am leaving for vacation in the 14th of Aug and unfortunately I will also be getting my period on that day. I'm considering Primolut Nor, to delay my menstrual cycle while I'm on vacation(5 days). I'm a smoker, have a couple of varicose veins but other than that, I'm healthy. I am also 38 yrs old. Is it safe? (I'm a little frightened because I tend to have allergic reactions to antibiotics.)