About three weeks ago i began to be exhausted and dizzy from nothing

Am I pregnant? Please Help! Im dizzy as i write this, but i seem to be really confused and i need advise- I tried going to my own mother but she won't listen and i tried my mother inlaw who seems very strongly opinionated that i shouldn't be... prego. About three weeks ago i began to be exhausted and dizzy from nothing. like someone had spinned me in a chair for too long and then asked me to walk. I go to bed at 11pm and get up around 9 am. so i get more then enough sleep but its not enough. smells make me go insane. everything makes me sick . my favorite foods make my stomach churn and i don't drink soda anymore since it also makes my stomache churn. my bra size is now a 40dd when it used to be a 36c- my lower back hurts all the time. i had my period "i think" but uit was weird- it started very late in the afternnoon on friday but it was just spotting. i put in a tamp and a couple hours later nothing was on it. but when i got up the next morning it was heavy and dark brownish but only for an hour or so and it was back to spotting. it was done by Sunday. the previous weeks my boobs hurt like crazy and they never do when im about to start. they ach as i write even and the sides are especially sensitive. I have mild cramping but its mostly in the middle or off to one side of my uterus and again- i don't have the usually premenstrual stuff like headaches, cramps, bloating or pimples( i usually have only one or two)- but im sure having them now. the pimples are bad on my breasts and face i also burp alot. and pee every half hour. but i did the test three times now and nothing. also my pee is very much usually a yellow, but its clear and usually it means your hydrated but i was definitely not yesterday or today and it was clear. I can't sleep at night anymore either and usually have to get up atleast once in the early early morning to pee. i see a doctor on tuesday but im afraid that if they do the tests they will still come up negative. I was pregnant once before and i didn't know it- i had been for about 4 months. i took the tests everytime i had missed my period but it was always negative. i only found out as i was having the miscarrage. so my summery of this is: Cramping (light) Spotting (27-28) Sorebreasts, itchy nipples Sudden extreme fatigue Hot/cold flashes all the time in 68d tempts dizziness on and off headaches on and off nausea on and off bigger boobs constapation/diareaha no desire for fav foods or drinks(makes me sick to even consider them) Super smell intolerence ( sweet scents, gas, cooked foods, meat, smoke, cig smoke)( i used to love the smell of car gas, but now i smell it, taste it and always makes me sick,same with smoke) sleeplessness frequent urination gassy/burping all the time and negative tests (3x)in a 2 week time period I just don't want all of this to be in my head... I really need advice. j.patton