hi I came off depo about a month and a half ago. I have had unprotected sex about three weeks ago. i experienced very very light bleeding for about 5 days two weeks after getting off the shot. i currently have breast tenderness, abdominal cramping, headaches, diarrhea , loss of appetite , lower back pain and nausea . could i be pregnant? i took plan b two days after the unprotected sex, but threw up within an hour and a half of taking it.