Hi Gemma - to begin with, often your insulin production hasn't finished completely so it will still produce some of its own - but you can't measure when or how much it might add, so it does make 'control' quite difficult to begin with. For some unfathomable reason many decades ago someone decided it was a good idea to call this the 'honeymoon' period. They must have had an absolutely vile honeymoon, that's all I can put it down to - I enjoyed mine and as far as I'm concerned that's precisely what they are for!
Also stuff like female hormones can send you high or low and in any case to begin with it's all a matter of guesswork and doing what you think anyway. So - it's never an instant fix - and certainly not something to worry about at this juncture.
Do you have easy access to your DSN for dosing advice whenever you need it?