What if i am pregnant, or not?

I'm twenty years old and have never been pregnant. i thought i was pregnant about two months ago but i took a test and it showed up negative. but lately i have been noticing i'm not feeling the same. I'm cranky, always tired, i have to use the restroom more then normal and i'm slightly constipated. My breasts are sore to the touch and I have gained at least five pounds in the last week or so. for some reason i feel hungry more often then normal. I'm due for my period but nothing has come yet. last month i spotted and cramped a week before my period and also on the month before that. i'm normally regular with no cramps or mood swings. i don't normally spot either nor do my breast start to hurt during my cycle. i've read about pregnancy symptoms and what to look for and i show a few but i don't have any morning sickness or anything. some cooked meat foods turn my stomach which normally don't, but not enough for me to throw up. am i pregnant?