I had been having a period every week or two. I was still bleeding when I was given the shot but it was just spotting. . My doctor ended up finding an ovarian cyst which was the cause of the irregular bleeding. I asked about depo so she checked if I was pregnant and then gave me the shot. I haven't bled since and had unprotected sex 8 days after my injection. Should I be worried or am I okay? Should I go for plan B?