Hi mama! Ang implant ay very effective talaga, less than 1% chance ng pregnancy kung naka-insert lang properly, so you're protected naman! But yung pag-pitik sa tyan mo, that could be many things, muscle twitches, gas, ligament stretching, or even just your uterus doing its normal thing, kaya mas safe talaga na i-check mo sa doctor para peace of mind mo, lalo na if it's bothering you or may iba pang symptoms. Better to get it checked lang para sure!