Ay, ganyan talaga ang Implanon sometimes, sis, irregular bleeding or prolonged periods ay common side effect, especially sa first few months pa lang or anytime really habang naka-insert ka. A few of us mums sa grupo namin experienced the same thing, kaya hindi ka mag-isa dito! But since it's been a month na, best check with your OB para ma-rule out kung may ibang cause, at para rin ma-advise ka kung kailangan ng adjustment o anything, baka may manageable solution sila.