Hi Mate
Welcome to Sw and the forum. Yes, many of us have done this, but the key is to try and learn how not to do it in the future.
If it is a one-off fine, but if it becomes a regular feature it will impact your losses. With alcohol, some good tips are swapping to spirits and diet mixers (most are 2.5 as opposed to a very small glass of wine being 4), alternating you glasses of wine with a mineral water, or (what I do) offering to drive- that way I know there is no chance of a weak moment, I just know I can't drink at all.
As it is your first week though, you will hopefully still lose.
Good luck for tomorrow and ask away if you need any help
xxxx