implantation bleeding experiences?

I was on the inplanon as concreception until end of June. I have logged my one and only bleeed on here with a 28 day cycle as I'm not sure what my cycle is. I bled for 3 days. I used ovulation tests which were accurate with the days on the app... my period according to flow is due on weds but today I have had pinkish fluid when I wipe. I put a bit of toilet roll just inside a bit and it was pinkish/brownish string fluid on it.

i know it could be a period and it's. only a few days until I can test, but what is everyone's else experience of implantation bleeding? and when did you get a positive test?