Hi again Hazelac, by now you should be getting a little annoyed that every one is fixated on counting your carbs for you instead of answering your question and helping you understand why your reading when to from 4.7 to 5.7.
First it is noting to worry about, readings fluctuate, there are so nanny outside factors other than food that can effect this, some thing as simple as a restless nights sleep can affect your reading so it's never to important to pay attention to any one reading.
IF you reading continue to go up over the course of a month or so then that's a different matter.
Something to remember is the device your using to take you blood sugar readings is only accurate to about 0.5 and taking that into account a reading of
4.7 +(0.5) = 5.2 just as the
5.7 -(0.5) = 5.2.

So both readings are with in the same margin of error even in the 5.7 seems raised an therefore more ominous.
When people will tell you not to worry about a couple of unexpected or raised readings
it can come across as dismissive because nobody takes the time to dispel your fears. I hope after reading this you can see that the 5.7 is nothing to worry about.
The crazy thing is worrying about it can raise your blood sugar levels, so don't give it a second thought we are not machines and out bodies fluctuate all the time.
Some of us (not looking at anyone onein particular
@bulkbiker ) flatulate all the time too.