I was exactly the same. Conceived dd almost immediately and let myself believe it would happen again just as fast.
As the months passed, friends all around me were falling pregnant again so easily it seemed and people were commenting to me not to leave too big a gap between babies (not my f*ing choice you cruel bugger, was the reply in my head).
I also got superstitious, tried to bd on exactly the same days of the month that conceived dd, had symptoms every month, heart breaking.
However, 11 months after first trying, I got lucky, no rhyme or reason, nothing done differently, am now 26 weeks and still counting my lucky stars. I hope this makes you feel encouraged, not worse, I just wanted to empathise, those 11 months were very long and hard to forget how horrible, the entire month, every month was given over to planning and analysing, and symptom spotting and disappointment.
Wishing tonnes of that good fertile babydust stuff on this thread!
xx