Could I be pregnant??

My SO and I have been TTC baby #2 since May 2014 when I had my mirena removed..so far no luck but during my last fertile window we had sex 3 times  and have several times since then but my period isn't due until October 22 but the last two or three days I've been moody and it seems like I can't get enough food I crave Chinese food constantly and even though I get full when I eat about and hour later I'm searching for something else..I just wondered if this could be what I've been waiting for..
​Also this passed Saturday I did have a girls night with my best friend and I did get kinda drunk..if I am pregnant would that affect my baby even though I would only be a week or so along?