Gave birth 8 weeks ago . Got my period a week after my 6 week check up . My period ended on november 7th . I got my first time ever depo shot on november 7th . (never been on birth control before) & im bleeding again. Brownish discharge . Is this a second period ? It started out being brown & now its light red . It switches to brown then red . & is it safe to have sex when i have brown / light red discharge ?