baby #2?

I'm the kind of person whose periods are always consistent. from length of time to symptoms. It's always the same. well, this month things have been differnent. I menstrated from the 5th to the 9th. from my recollection, it was an average period. my daughter's dad and I had sex unprotected right after it ended and a couple days later I had some mild cramping - something that doesn't occur unless I'm within days of menstrating or currently bleeding. then about a week ago, the cramping returned. and shortly after, so did power back aches, sciatica and dizzy spells. Tuesday I took a pregnancy test and it came up negative. today I have increased symptoms. along with the initial symptoms getting more intense, I also have been experiencing dull pains in my breast, growing-like pains in my pelvis and also a dull pain near my clitoris. the pain is infrequent, but still unusual. the calender said I'm not due for a period for another right days. how am I having all these symptoms? and to add, I ALWAYS am super emotional before I start and I'm more calm than usual. do you think I'm pregnant?