I NEED HELP!!

OK IM A 23 YR OLD FEMALE AND I WANNA KNOW IF ANYONE CAN TELL ME WHAT TO DO OR WHATS GOING ON. I THINK IM PREGNANT I HAD MY PERIOD THE 21ST  OF JAN. IT WAS NOT REALLY NORMAL IT LAST USUALLY 6-7 DAYS AND IT BARELY LASTED 4 THIS TIME IT WAS LIGHT PINK/BROWN THE WHOLE TME. MY BREAST ARE NOT TENDER IT STARTED WITH THE NIPPLES THEN AREOLA THEY ARE JUST TENDER. I HAVE HAD CRAMPING ALMOST LIKE PERIOD CRAMPS BUT NOTHING HAPPENS AND I NOT DUE AGAIN. I HAVE BEEN FEELING SICK BUT HAVE NOT GOT SICK, I HAVE HAD THE WORST ATTITUDE EVER AND IF SOMEONE LOOKS AT ME WRONG I JUST WANNA CRY THATS ALL I HAVE DONE IS CRY MY BF KEEPS ASKING WHATS WRONG I JUST DONT KNOW. I HAVE GAINED 10LBS IN A MTH.. AND EATING LIKE CRAZY. ALSO BEEN GETTING DIZZY SPELLS OFF AN ON. I DID A PREGNACY TEST THAT FRIDAY IT WAS NAGATIVE WENT THAT SAT. AND THEY DID A BLOOD TEST IT WAS NAGATIVE. I STILL FEEL OOOO SOOO PREGNANT. ANYONE KNOW WHAT TO DO.???