TMI DISCHARGE! My period is late :(

I have taken plan b two months ago. I got my period last month but today it's been like over a week late. I have been cramping a ton this past week like normal and my breasts are sore like normal before my periods. I get this color discharge when I put my finger inside and pull it out. It's like brownish. The discharge has been happening for about 2 days. What do you think? Should I wait a little more and stop stressing?