I did back to back and got my best response to stimming ever and also got a BFP.

IVF#1 June 06 - Cancelled
IVF#2 July 06 - Zero Fert
ICSI IVF#3 November 06 - 7 eggs, 2 fert, BFN
ICSI IVF #4 December 06 - 10 eggs, 3 fert, BFP

We would have done back to back from July onward but we had an overseas ...

Yes!

My November cycle was a chemical but December was a success.

Don't give up