Skipping Periods w BC

Mars

Hey y’all. I started birth control a few months ago and finally decided to try skipping my period just to see what happens. I skipped the whole week of placebos, Sunday-Saturday. Saturday though, the day my period was due, I had spotting and a little bit of blood when I went to pee. But the blood was more brown and seemed just to be old blood. But there hasn’t been anything more since. Is this normal, and is that supposed to be my period shortened up or is that really just spotting? I hope that makes sense. I take the birth control that has 3 weeks on and 1 week of placebo.