hey my girlfriend and i had unprotected sex on the 6th dec 2010. She took a contraceptive pill the next morning and got her periods prematurely on the 11th dec for about 4days. She also had some bleeding on the 5th of Jan 2011 wich was very scanty lasted 2days. When will she get her regular periods. We are both very tensed about te same. Can this pill have adverse effect on her natural system