negative test positive symptoms!

So for the past like two weeks I've been extremely moody, craving random foods, super nauseous, my acne started up like crazy and I've had boob, head and back pains like nobodies business but I've taken like 5 tests within the last few days and it says I'm negative. I'm supposed to start my period the 24th but I never get like this before a period at lest this far in advance of my period maybe the couple days before but not weeks before. My body is telling me I'm pregnant but my pee is telling me I'm not! I don't get it could my body just be tricking me or could I actually be pregnant and the tests not be accurate? I just feel like this amount of symptoms for this long has to be more than my body tricking me. What do you ladies think?