Slightly raised BG

Over the last couple of days I seem to have slightly higher BG, up to about 0.5 higher than normal. I am eating the same as usual but have slight sore throat, could this be the reason? Or the plant sterols I have just started taking ( ingredients don't have any carbs or sugar)

Well I usually stay within the 5's during the day and I am usually mid 5's to mid 6's going to bed but over the past few days I have barely seen a 5 and yesterday at bedtime it was 7.1, about two and a half - 3 hours after dinner. Fasting this morning was 6.5 so very slightly up as normally around 5.8-6.2. Today has been a fasting day, as I do intermittent fasting, and normally I will be around 5.3- 5.8 before dinner today I was 6.2.
I know it is only slightly up but just wondering if it likely to be my body fighting a sore throat or the plant sterols I have started taking to reduce my cholesterol, although I have read that they can actually bring levels down. I am still learning how things affect my blood sugars.

That's what I'm hoping. I'll keep a check on it.