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if you aren’t deficient you most likely have many months of b12 store.
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the tablet is about 1000x what your body can absorb daily. Don’t take two.
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unless you are just starting the treatment for a profound deficiency don’t sweat about it, but do build yourself a better system to remember.
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you won’t be anemic because you forgot a few dose, same thing with neurological symptoms: if you feel bad there is probably another explanation.
This isn’t medical advice because we don’t live under the same laws and maybe i don’t have your full information…
Some vegan look into yeast as a source of b12 : same problem than the tablet you need to remember to add it to your recipes. Since your lack of b12 comes from a diet choice we can expect your stomach to produce the “intrinsic factor” required to absorb b12 : you are fine.
That’s perfect : we keep our dairy and they keep theirs.