Help???

So hey! I was on trinessa (terrible birth control) it had 6 inactive pills or something. I can't remember. I got my period always on the 4th day of those. But now, I'm on a different bc that I just started this month. It's minastrin 24 fe. It has 4 inactive pills instead of the 6 on trinessa. Should my period start right when the inactive pills start?? Or will it be like trinessa and come like 2 days after I start them? I really need to know because I super stress out about that kind of stuff. Let me know if any of you had a similar experience !!