Unfortunately it's probably because people don't know the answers (I've just done a search to see what your other threads are). People can only guess and maybe a GP might be the best person to ask. Good luck.
I've just searched your other threads too. I think you should probably check with your GP, but, I honestly don't think you have anything to worry about.
The first period after pregnancy and breastfeeding can be horrendous and your cycles may be a bit off, hence the additional bleeding. But if you are still worried go to get it checked out. I hope you're ok.
Really sorry you find yourself in this situation.. I am not really sure what I can add to this but I don't think you will know what's happened either way.. When you say questionable positive..Was it just faint or could it have been an evap line? I hope you get an answer either way soon..BFP or AF.