I'm no oracle, but am quite happy to fuel the flames of your madness if you like. 
The symptoms do sound promising, especially, IMO, the tiredness, which can be a real giveaway for some people.
It's true that you have to be a bit disciplined with the POAS and sounds like you managed to both upset yourself and piss away a fair few bob last month, so if you can, wait until tomorrow and test only if there is no sign at all of AF. If you use FMU, you should have a clear answer one way or the other by then. And no more poasing allowed after that, unless several days have passed with no AF. So you could buy a test this afternoon after the delivery and then use tomorrow or if irrelevant by then, save for next month.
TBH, when I had DD, I had no symptoms at all really except the tiredness, which I really only noticed when looking back on it, but just thought I was a bit knackered at the time. So you can't build on the ol' symptoms too much.
Fingers crossed for you though!! The 2ww is always hard.