Could I Be Pregnant??

So me and my boyfriend have been ttc for about 6 months, and each month I've had my period(none of which were late) but between each one and while on my period I've been havin a lot of pregnancy symptoms, even my pregnant friend said I have more symptoms than her: bloating, sore breasts, bad back, peeing alott, feeling sick, headaches,cramping etc.. (I've had this even when I'm not due my period) Now I was due on the 16th and still haven't come on, I did two pregnancy tests the day after my due date and both came back negative. I'm bloated,have reallllly sore heavy breasts and keep peeing a lot. Could I be pregnant and its just to early to have a positive? Or could it be my mind playing tricks on me? Anyone eles had this??