I have been taking the Depo-Provera birthcontrol shot for about 9 months . well i was due for a shot between April 18th-May2nd , i missed my shot on April 18th and had unprotected sex on March 29th but i didn't think anything of it because it was before i missed my shot , well i had unprotected sex again on May 1st , then today which is may 9th i started having a brownish discharge but it isn't constant like my period ?! what's is this from ? missing my shot or am i pregnant.