Would this be a normal thing to do?

Hello ladies!

I recently started BC pills and I’m on my first 28 days set. I’ve finished the hormone ones for the first three weeks and I was wondering if you have to take the white pills AKA the placebo pills or can you skip them. I haven’t had a period in a month due to starting these pills before I started. So I was wondering if that would be a normal thing to do? I did some research and I read it was normal if you just wanted to skip into the next week of hormones but I’ve always thought you had to have a period regardless.