Finally back in front of a laptop!
Clearly nothing is definite unless AF turns up. I think it best to look at the positives, no AF, increased cm, a much longer LP than last cycle, and I know I'm no expert and I've mentioned it already but I really think it's possible you O'd on cd18, so it's still a possibility you'll get your BFP.
I just really feel like it's your cycle, as soon as you mentioned all the CM etc, but I understand it is hard to stay positive. If it's not the one, then it's important to let it all out, you can always rant away here.