I am 23 years old have been off of the pill for two weeks while having unprotected sex. When I was 15 My doctor told me I was showing signs of having PCOS but never got a final diagnosis. I now have missed my period by 6 days. I took a pregnancy test and it came back negative yet I have sore breasts, I'm using the bathroom more and I feel a lot of peruse in my lower belly area and bad mood swings. What could this be?