What do you eat for tea? And have you tried testing after 1hour, 1hr30, and 2hrs30 as well? I don't mean you should do that every time, but it may be that your bg peaks later or earlier than average. For example I can see 5.1 before a meal, 4.9 after 1 hour, 5.6 after 2, and then even 6 after 3. I am a bit of an extreme example, but you get the idea. The normal bg is supposed theoretically to rise to a peak after about 1hr and descend back pretty much back to pre-prandial levels after 2. But if it only gets up to the peak after 2hrs, and has come down by 3hrs, that seems to me to count about the same.