Hai! Okay, I get your worry, pregnancy scares are real lah! A few of my mum friends guna implan and they swear by it, takda issues so far, tapi memang ada small percentage failure rate macam semua contraception. Depo pun ramai guna, side effect dia lebih pada weight gain and irregular bleeding at first, tapi effectiveness wise sama level je with implan. For double protection, honestly most of us rely on the method je once we're settled, tapi kalo you extra paranoid like me boleh lah pairing with condoms especially first few months habis insertion. I'd suggest you chat with your doctor or family planning clinic dulu sebab they can explain the failure rates and side effects in detail based on your body, and they can also address that pregnancy fear you have, might just be misinformation you came across. Take care!