Idk if im preg. Or not

A whole month went by no period. last period was Dec 15th has anyone ever missed a period a whole month before & later found out they was prego. This never happened to me, over 2wks late. Took one test at begin of wk it was neg. Could I possibly be pregnant. I feel like I am always tired boobs soar an I feel bloated an nauseous also having a white creamy discharge.!