BS up today not sure why

Morning all. Very confuse and annoyed today. Woke up this morning bs levels 5.4 had my normal porridge this morning and then tested 2 hours after up to 9.9. Retested but it's right. Really don't know why as I normally have porridge and it's been in the 7 range. Will check in 2 hours and see if came down

Just test by bs 4 hours after eating and it's now 5.6. Not sure why the difference is oh well I will just see how today goes