Hi There, I`m 29. Today I Went To See My

Hi there,
I`m 29. Today i went to see my gyn, and it turned out that i`m 5 weeks pregnant. Apperantly i`m expecting twins. :) I`m merried, my HB is great, all is ok in my life to keep these 2 little ones. (I`m still shocked about the fact that they are twins, nothing like this happened in none of our family`s history). My problem is, that this is not a planned pregnancy, we used protection, so i had no clue about whats going on in my body. Recently we went to a lot of parties and since i had no clue i`m expecting, i had plenty of alchol, and i was smoking till this morning. :( I`m sad and worried about what effect it can has on these little things inside me. I`m afraid i`ve damaged them without intention. Can you give me some advice on how the alchol can affect my twin pregnancy (i`ll not have any alcholol or cigarette ever in my life!!!). Thank you if you can give me the true answer for this question.