What you have mentioned about uttering the word “Harramt” is subject to further discussion:
1 - If you said this word without thinking and without intending what it means, then you do not have to do anything.
2- If you meant what you said, then there is a difference of opinion among the fuqaha’ concerning this word. Some of them regarded it as zihaar (a jaahili form of divorce in which a man said to his wife: You are to me as my mother’s back), and some of them regarded it as talaaq.
The most correct opinion concerning this matter is: if he intended it as talaaq, zihaar or an oath, then it is as he intended. If he did not intend anything, then he has to offer expiation for breaking an oath. This is the view of Imam ash-Shaafa‘i (may Allah have mercy on him).
See also the answer to question 81984
So long as you did not intend talaaq (divorce) or zihaar, then expiation either is or is not required; as you have offered expiation for your oath, you do not have to do anything else now.
And Allah knows best.