Gianvi/ Yaz

Hey everyone! I’m on my first month with Gianvi which is the generic of Yaz I guess. Anyways there’s only 4 placebo pills instead of a week. And on sprintec it would take me til around day 4 to even start my period. Does anyone have any experience with this Brand? I’m on day 2. And though I feel like I should be bleeding I haven’t yet! Thanks