Hello, i had taken only 1 depo shot in january and my bleeding has been on an off since . It went away for 2 weeks and started again around 3 weeks ago. it became quite medium heavy until i had unprotected quite a lot sex 3 & 2 days ago, since 2 days ago it has become very light and turned from bright red to brown and yesterday is practically gone. Last night i had some back pain and a little cramp in lower abdomen and has been on and off since. Im unsure what is going on but has anyone had this?