Okay the last time I went to the health department they told me I had to come back the 15th through the 29th to get it. I couldn't come the 15th so I came the 19th and got the shot. Two days later I had sex and I'm worried I may be pregnant because I was bleeding for one day and after that it stopped. I don't know if it was just random spotting or implantation bleeding. I'm probably just over thinking this but I would like your guys help on this.