i think imprego

hi my name is nija. and i had a late and abnormal peiod in noveber. my period was 5 days late then when it came it lasted only 3 day. the first day i had spotting the second day it was pink with light red. then the third day it went back to spots and it stopped. my period is usually heavy and i go throught 4 or more pads. and it ususally last lik 5 to 7 days. my friend said that was not a normal period. so i have not had a normal period in 2 months. i took a test a week or 2 ago and it was negative. my symptoms are missed period, headaches and bad crmping.