What's going on?

Krista
Friday I was spotting brown for half the day, then Saturday morning I had sex followed by pink and brown spotting for half the day. Then a little more brown half of Sunday. Monday there was nothing then Tuesday and yesterday more light brown spotting. I'm not due for my period until 1/7. What's going on?! I took this test yesterday..I'm on birth control but missed some days and took some pills late.

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