My last period ended on February 18 & usually lasts up to a week, so i should have started February 11. It is now April 12, 2 months after my last period & no show of it yet. I have also taken 2 home pregnancy tests & they both came out negative. I live with my boyfriend, so im sexually active. I have an appointment this weekend to have a blood test done but worried if im not pregnant, what else can it be?