You can't blame yourself at all! Unfortunately it just is what it is! (sucks)
And you are bang on about Dr's! I realized that on my first cancelled OE IVF! When they xl'd me right after selling me the $1500 worth of drugs and then refused to take them back! (mother Truckers!)
But...don't count this cycle out yet! You did only transfer 1! Most that get + this early are pregnant with 2, so...you just don't know yet!
I've still got my fingers crossed for you!
All my best!