i was on depo for almost five years and ive been off for almost seven months my last shot was in march and that was my last injection i finally got my period in november it last five days in december i was suppose to start around the 18th and ended up starting on the 24th it started off heavyish then went light and then i only bled during sex and when i urinate ive now been bleeding for 11 days ive taken pregnanct test and they all say negative could i be pregnant or is this something more please anyone help?