Feeling guilty

It’s my first cycle TTC and I’m in the two week wait. I went out last night with friends and had a bit too much to drink and had a couple cigarette which is terrible. Just feeling like I let myself down I’m really trying to be healthy and feeling just like irresponsible. How do people deal with this in the beginning - I feel like it’s all just about having will power and sucking it up. I have been making so many lifestyle changes so just like damnit don’t want to slide.