I had my first ever depo shot about 2 and a half weeks ago. Within about 5 days I had a tiny bit of spotting, just looked like the strt of my period but was only for a day and only when I went to the toilet. Now for the last couple of days I've had quite heavy spotting (again usually only when I go to the toilet and a bit inbetween), but now it's an awful brown colour. I have had unprotected sex since having the shot, but I dont think I would be pregnant but alot of people have said they spot after sex. Any ideas??