It could possibly be an early m/c. I would go to your GP and request a BT just to see if you have any hCG in your system and if so whether the levels are going up or down. It's always best to check, just for peace of mind.
Are you still breastfeeding? If you are breastfeeding still it could also be due to that. It is not uncommon for your first few cycles after AF returns to be extremely heavy and last quite a long time (like it was after you gave birth). Is it possible that your last AFs were just break through bleeding and not actually AF at all?
I was just giving some further ideas, but if you are concerned about it, you should see your GP.
The faint pos after 10 mins could've been evaporation lines (which is why the HPTs say not to read a result after that time) though evap lines are usually clear. A similar thing happened to me in January and as you can see from my sig was an early loss.
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