Where is my period?

I have always had slightly irregular periods. Also, I am on birth control.
The day I was supposed to get my period, I had a very very light flow, like i usually would when starting my period. Then, it stopped that same day and didn't come back the next day or during the week. Now I'm almost a week past that day. I am just wondering if that one day of an extremely light flow could have been my period? (Also, whenever it is that time of the month I always breakout with acne and my face has had awful acne this week)

So, did I have my period? or am I missing my period right now?

Thanks, D