Is this my period??

I’m on the pill and I just noticed the other day that I somehow missed an active pill. I don’t know how but I found it on my floor. Well I’m on my third sugar pill now and I noticed a couple days before I started my sugar pills my discharge was a little brown. Now that I’ve been taking my sugar pills these past couple days I’ve had a good amount of dark brown clumpy blood? And I also have a little bit of red blood too. But it’s not a lot like my normal period, it’s not a tiny bit but it’s still a good amount. I’ve also had some cramps too. Is it my period? And is it just like that because I accidentally skipped a pill? I also dealt with a lot of stress within the past 2 weeks so could it also be because of that?