help,11 days late

11 days late, before i was supposed to get af i was having dull crampin, nauseous, back pain...the week that i was supposed to have it all those symptoms went away.. after being late 3 day i took a test n it came back neg. 7 days late took another one and it again came back neg. yesterday i took another test and it came back neg.today i woke up and my boobs feel sensitive and full,the cramping is back.. have had alot of discharge too amd my nipples look to have gotten bigger amd darker... anyone know the possibility of me being pregnant..