Does it sound like I am pregnant? Should I take a test?

I have pcos. So usually I don't get my periods on my own. But the last three months I was getting them regularly. I am now almost 4 days late on my "expected period". I have been having headaches for the last week, nauseous, I have thrown up twice today, I have been very moody, can't concentrate, I get irritated very fast, I have been emotional. 4 days ago I had creamy white (lotion like) discharge. My boobs are some what sore ( but not all the time). I don't know what to think, can you please help me. What do you think is going on? 

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