That figure depends on what I've eaten, when I ate it, the outside temperature (raises my BG), what physical work I've done (BG up and down, erratic), whether I'm ill or not (BG up), whether I've had any alcohol (BG drops like a stone) ....there are more. I eat around 20g carbs/day - some days much less. I'm normally in ketosis, running on ketones due to low intake of carbs. I estimate today (so far) about 5g carbs, yesterday about the same. Didn't eat at all until 7pm, just coffee until then, had done a bit of clearance work in the garden, and I did happen to test tonight - I don't usually these days unless I'm eating something new. Tonight was because I had only one strip left in the pot and it needed using.
That's the context for the reading I had of 5.0, which was unsurprising, and might have been anything from 4.3 to 5.3 on another day. I don't usually see a big rise in BG after eating, maybe 0.5 generally (from veg) or as much as 1.0 if I've had (eg) chickpeas in a curry. I don't want high levels - it's been a long time since I had a result above 6.0 - but I also don't want spikes.
Just as my reading depends on a huge number of factors, it will have no relation to yours, even if you did exactly the same things. You have to learn how your own system responds. I record my readings and keep notes of what I've eaten and any other relevant factors. It's really helpful.