Period started before placebo week?

So, I recently started using birth control and I knew it would sort of make my period a little late or inconsistent. But I don’t start my placebo pills until about a week later but I’m pretty sure my period just started. It’s lighter than usual but it’s more than just spotting. I have taken them at EXACTLY the same time every single day. Can this happen before the placebo week since I just started using them? Also I started taking them the week of ovulation and I wonder if possibly the pills didn’t “fully stop” my period from happening so it still happened somehow.