Make an appointment with your OBGYN. It might just be typical pre period hell or there could be other problems such as endrometriosis, which is when you have your period you shed cells which normally are fllushed out during your cycle. Sometimes these shedded cells migrate to other places, causing scar tissue build up which is pulled to the point of pain when you are getting ready to have your period.
Your OBGYN might also send you to an internest, to check out your colon, liver, stomach etc...
It is really too soon to tell. PMS is so much like early pregnancy, and it could be you are coming down with some kind of bug. Test again on the 14th.
Good luck!
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