I'm 17 almost 18, I've been on the implant for four years, the first year was a mess up because the old implant got recalled and they put it in anyways, so I was left with spotting, and abnormal periods, they took it out and put in a new one, it's been I think three years, but it's fuzzy, and now I'm bleeding old brown blood and the cramps have been going for weeks. I don't know if that's serious, or if I'm just freaking out because I haven't had a period in so long.