Hindi ka nag-iisa, sis! A few of us in my mum group actually experienced the same thing, one friend had super heavy bleeding din after getting the injectable, kaya nag-switch sya ng method. Ang injectable hormones talaga ay nag-aaffect sa period, sometimes it gets heavier before it settles, pero if it's really grabe like yours, better check with your OB para ma-assess kung normal lang yan or kung may iba na concerns, pwede ring mag-suggest sila ng ibang contraceptive na mas OK sa'yo. Rooting for you, momsh!