Is it correct to use the word "itself" in the following cases. I have seen many people using "itself" in the following cases
- I read the note yesterday itself (to mean - I already read the note yesterday)
- I met the doctor in the morning itself. (to mean - I already met the doctor in the morning)
if the usage of "itself" is itself wrong, what would be the correct usage or alternative to express the meaning mentioned in the brackets

