Ay, I haven't used implant myself but a few of my mum friends who have say ang common side effects ay irregular periods, spotting, or walang regla for months, it varies talaga from person to person! Some of them got breakthrough bleeding, slight headaches, or mood changes lang, but honestly most settled in after a few months. Mas importante talaga na kausap mo ang OB mo about your medical history kasi every body is different, and she can explain kung anong mangyayari specifically sa'yo, worth it talaga to have that conversation before deciding!