I am 20 years old and my last period was the first week of Feb 2009 from the 2th to the 6th. I have not had my period this month. My breast are sore and i feel some cramping in my lower abdomen but it is the same feeling i get the week before i normally have my period. I am not nauseous, but can i still be pregnant? Also before my period in February it was from the 7th-11th in January. Meaning my schedule changed. Could it be possible that it is changing this month also? I would greatly appreciate any feedback.