What's wrong with me?

I started taking birth control two weeks ago. Before I started it my period was really light which is kind of unusual for me. My boyfriend says that I've become a lot more emotional and defensive about silly things which I agree with. I've been peculiarly depressed lately when I'm normally a pretty bubbly person. Today I started spotting a little bit it looks like dried up blood what I usually experience at the end of a period but I'm not supposed to get my period for another two weeks so idk why this is happening to me. What's wrong with me? 

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