What happened to my period!?

marie

I recently (a month ago) changed from

My usual birth control pills that contained 7 blade I pills. Now I have new ones that only contain 4 placebo pills instead. Problem is, I haven’t gotten my period and I am already done with the first pack and started the new one already. I had pains jus fluke when I get my period but only I was only spotting throughout this time. Is this normal?