Morning,
You say it is up in the 14. How does this ocmpare to other reuslts? If your other results were higher on average then this is good. If not, how much higher? Has it gone up by just 1 or by 5? was this a Fasting result first thing on a morning.? Morning Fasting results are higher due to the "dawn" effect.
Lots of stuff can cause increases - the common one is food. what are you eating? Have you been eating a lot of carbs?
Another cause could be stress.