So I got my first birth control shot on June 15th. My sister is also on it and she stopped getting her period after her first shot. I am 13 days late for my period which is uncommon for me as mine is usually quite regular. The past 4-5 days I have been experiencing some light pink discharge at times. It doesn't last all day, and it isn't a large amount, it just looks like one of the last days of my normal period. Is this related to the shot and lack of period? Has anyone else experienced this?