Period? Late.. Pregnant?

leslie
It has been 6 days since I got my period. It ended 2 days ago. And it was short this time, 3 1/2 days only( usually it last 4 or 5). It was also late by 4 days this month (idk why). These past 2 days I have been staining brown in my underwear. It's a little bit but even when I wipe is brown. I think it's like old blood because it seems like it has happened once when I start my period only not when it ends. Anyone else has experience this ? 
It's wet and dark brown. 

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