I had quite a few glasses of wine at my mums house over dinner one night which I don't normally do (maybe 1 glass every now & again).
Well I was pretty hungover the next day but also found out the following day I was pregnant. We werent using contraception just if we fell pregnant then DH & I were happy.. & we did.
I didn't feel too bad because I honestly didn't suspect being pregnant. I think if you are worried then don't drink if you think you will regret it if you are.