I actually think sometimes that us having a drink while TTC relaxes us, and gives us the opportunity to fall pregnant.
The month I fell pregnant with Jenna same thing - we were away on holiday drinking up a storm. I think about 2 days before I finally decided I really could be pregnant I had polished off half a 1125mlof vodka bymyself mixed with redbull.
It was a day or two later I decided to slow down until I could get home and get a positive test result.
Even now I have occasional glasses of wine. Maybe 2 a week? I have been told there is no safe limit, but I find that 2-3 standard drinks a week to be an acceptable risk in my life.

Enjoy your pregnancy - there are so many more fun things to come - you dont want to do your head in this early!