Ay, normal yan sa Implanon especially sa first few months, ang body mo pa lang nag-aadapt sa hormone, kaya yung spotting at irregular bleeding ay common side effect talaga, lalo na if you just got it inserted recently. But if it's been more than a month na at sobrang heavy pa rin or nakakasagabal na sa daily life mo, I'd suggest checking with your OB na lang para ma-rule out kung may iba pang reason, kasi bawat body talaga ay different sa how it reacts sa implant.