Can taking insulin make your sugars spike.

@Ryann1990 . Firstly if I was 12.5 and did a correction dose I wouldn’t contemplate checking my BS again for at least 30 mins.
There’s no way your insulin is going to be absorbed into your system any quicker, especially that small amount at the end of your fingers.
Unless you have some type of CGM it’s going to be very difficult for you to know if your12.5 reading is a steady reading, a rapidly rising reading or even a reading that is falling.
Only my guess but I suspect your blood sugar was rising at a steady rate hence the climb in such a short space of time.
Another thing to consider is that you have corrected for 12.5 but because that is probably rising at a fast rate the end result of the correction dose in 1 to 3 hours time may not be as good as what you was hoping for.
It’s always good to try and take into consideration why your sugars are where they are and the reasons behind it in circumstances like this.
Apologies if you know all this already.
Good luck and remember stress most definitely increases BS levels no matter what.