i am 18 years old and i was supposed to start my period 14 okt, and im like 3 weeks late, 2 weeks ago i had like a cramp in my stomach and the next morning there was a litle blood, very light and it went away few hours later, and i'm usually 5-6 days on my period, i have been feeling moody and kind-off sore breast, and like a cramp sometimes in my lower stomach , and tired all the time, :/ Could i be pregnant?