Missed my period!

So I’m on birth control been on it since the middle of May. I have had my period. But this month I am late. I am getting a little worried. I went to the doctor yesterday and didn’t think much of it to ask. Because I thought it’ll come on.. But I’m on my last week of my pill packet I am on the little white and brown pill I believe those are the pills that start your period. I don’t think I am pregnant because my doc didn’t say anything. Soo idk.. is this normal..