Could I be pregnant??

i had my period about 3weeks ago i had after my period..like a week in a half later i feel like a slight cramping then i check my pants(tmi) and i have a like a spot of brownness (i thought it was my period starting but it had a tiny hint of red) well the next day there was nothing then the next day i had the brown again n then it happened again a few days later(i had a slight cramping before each time)for the last week and a half ive had no appetite at all...im hungry but there is absolutely nothing i want to eat...and for about a day i had an extremely sharp pain all the way down from my to my lower pelvis only on one side....i have heartburn....i have gained weight even tho im not really eating anything....around the time ov my period i crave everything i eat like 10000000 things a day but now its reverse.......and i dont really have diareha(<--misspelled) but i do number 2 alot more than usual(tmi again sorry)ive also have had alot more discharge than usual...could i be pregnant?