First response. I guess there is a chance you ovulated immediately and caught it (which would actually make you 4 weeks) but I think you need to prepare yourself that this might take some time. Until you get your first period you won't be really able to figure out ovulation unless you use OPK's daily.
Those tests are fine, they're the ones I used, but I'd give it another week or so as it's really too early. When I came off hormonal birth control I literally felt pregnant every month but it was 5 before I actually was. Your mind can play all kinds of tricks on you when you're over thinking things!
I've had SO many preg symptoms, I kept telling myself this could just be ovulation try not to get my hopes up, but then I got really heavy boobs and sore nipples. I have never ever had sore nipples/boobs before.
there is so many more symptoms I have got in the past week and a half, I really hope it is positive.
OP don't forget that you have just come off a hormonal implant, your hormones will be all over the place anyway so I wouldn't read anything into sore breasts or basically any pregnancy symptoms which will be the same as non pregnancy normal cycle symptoms. It's a head fuck! As for when I'd test....you simply can't know when you ovulated or if at all yet but I'd actually test today and then once a week until either a positive or your period starts. But that's quite OTT! I just think that's what I'd do.