I am going to Cancun from September 19th to 24th. After I booked the vacation, I realized that my period is starting from 19th. I went to my doctor yesterday (9/7) and got pills. Doctor told me that I can start taking the pill from today (9/7) until my trip is over. The name of the pill is Lessina. After I read some experiences online, I am little worried about having spotting blood. Does the pill really work for period-free during my vacation ?