please help i got the depo shot on november 13th,i got ma period december 4th and it was very light bleeding for 1 day was vey scanty the next day i didnt bleed unless i went 2 urinnate.the 3rd day i had sum bleedingand it stopped 3 hours later.the 4th day no bleeding,then i woke up in the middle of the nite with blood soaked pants on,i went 2 the bathroom and it wa a lot of blood comin out.umone pleaz help.am i pregnant