I dont know what to do

Last time I posted something, I was late. now, same cycle, still late, cycle day 45 of a normal 28 day cycle. Also now, my fiance just left me... I'm trying not to get too upset, because I very well could be pregnant. but it's so hard not to get so down about it. And if I am pregnant, I'm alone. I know things may go back to normal with him, but I'm not holding my breath... I miss him terribly and I didn't get to say goodbye the way that it happened.