It is perfectly normal for cycle length to vary from month to month - we don't all work like clockwork. I have read that a variation of about 5 days is perfectly normal - so your kinda like that!
The most variable part of the cycle is the first phase, the follicular phase - all sorts of things can throw this out of whack! Like stress!
Me, I always look for signs of O and then I know that AF is going to turn up about 14 days after that! SO if you were O'ing around day 20 to 21 AF would still not be late.
I'd take the cycle length as the last cycle and test after 34 days to get a more accurate result.
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