Hi
@Lynmi, as a T1D, not as professional advice or opinion:
first of all,
we have all make some mistake like this, it happens and reminds us that we are human and that we have this extra burden of having to check times over and over !!
Be kind to yourself and as you know worry only puts BSLs up !!
I assume you have your glucose meter with you ?
You can at least
monitor your levels. you would expect a rise in your BSL from breakfast but higher than usual.
Can you speak with your DSN or doctor to get more advice? If you google 'picture of profiles Levemir' you will see that it has a fairly flat profile or low persisting blood sugar -lowering effect), certainly compared to Novorapid. So is does not seem likely that it would help much but do see what your DSN or doctor says.
I suspect that your DSN or doctor will suggest not to eat much in the way of carbs but also ask them , if your BSL gets up to say, 14 mol/l plus, what can you do? And BTW lots of water helps to keep the blood 'watered down' a bit.
I know of someone, and i cannot recommend it, that was able in a similar situation but with BSL near 18 mol/l to inject some long-acting insulin into his muscle, where it was taken up more rapidly and helped bring down his BSL, thankfully not too low. He would have had to have a muscle close enough to his skin to have managed this with the short needles these days !!
Hopefully with advice you will see through the day with minor inconvenience.
Edit: And your Mum and Dad will be none the wiser !!!