This is all so confusing. I've ruled some methods out:

Diaphragm
Cap
Vaginal ring
IUD
IUS



Which leaves the pill, implant, injection and patch. I'm not sure if I'll be able to take the pill; Brook website says you can't take it if you take anticonvulsants. The patch seems a bit strange to me, I'd be worried about it coming off and not noticing or forgetting to replace it. The implant looks ok, it can cause irregular periods though, which is not what I really want. I wonder if the patch can be used for two months, like the pill