I wouldn't advise the implant. For some people, it stops periods altogether, but I've heard of people bleeding for months on it and having really irregular periods on it.
On any hormonal contraception, you won't have "periods" but withdrawal bleeds (if you bleed at all) but missing a withdrawal bleed is still an indication of pregnancy. If you want natural periods, your options are condoms or the copper coil
Otherwise, there's the pill, if you're worried about remembering it, I'd consider the patch or ring, which you change weekly rather than having to take regularly every day. Anything more long term, such as injections, implants or the hormonal coil, has the potential to mess up your periods, but that doesn't mean that it definitely will.