I took my 7 days of dummy pills (ortho-low) and began my new prescription of YAZ. I took them for 6 days and had unprotected sex (not actually willingly). Then I fulfilled my month worth of YAZ, well now it has been 4 days that I have been on the YAZ dummie pills and have not started my period. I only have 2 more dummie pills left then I start my new pack. Is it possible to get pregnant switching pills and or is it normal to not have a period the first time switching to a new brand?