Hai sis, memang kena jumpa doctor sebab setiap orang lain response dia, since you had prolonged bleeding dengan injection dulu, important sangat dia check your history dan suggest yang paling sesuai untuk you specifically. A few of my mum friends guna pills and IUD, some prefer the implant arm thingy, tapi satu mak aku tanya dia cakap the copper IUD paling minimal side effects for her, jadi really varies la depending on your body. Best lah call your gynae or nearby clinic, biar dia guide you based on what happened before, they'll know your case terbaik!