i agree with missc, a baby will feed off the yolk sac for a few weeks after implantation, while the placenta is being established, so do not fret about the odd drink during the 2ww, this time round i decided to give up alcohol completly while trying, as i was in a terrible place emotionally and alcohol would make things so much worse...even over christmas and my 30th birthday, i didn't touch a drop, but that doesn't mean i don;t worry about the headache tablets i took before i found out, or the bad cold i have had last week. you just need to trust in your body and hope that things will work out.
i am 6 weeks pregnant again after mmc in november 2010, ectopic in may 2007 and mmc in february 2007, i am also lucky to have a beautiful daughter who i conceived after my ectopic in 2007....i did have a sip of champagne when i was 6 weeks pregnant with her as it was my wedding day, and she was the most perfect baby.
hope you ladies are able to find some peace and continue on your journey to motherhood, believe me it's totally worth it x