No I wouldnt say so, I would say dont drink too much but the social drink wont affect you.
Congrats on the wedding! I would say take this time to get to know your body changes through your cycle as well as you can. Even start yourself a wee ticker with your cycle dates on it just to make sure that your cycles are regular, as regular cycles is a good sign of regualr OV, also keep an eye on your CM this changes through your cycle, mines is random as I think my implant mucked this up, so this month I am using C+ lube which is good. Your CM should be egg white around fertile time. Look out for signs of OV like side pain around mid cycle all this together you will be on the ball by the time you officially TTC!
Its up to yourself when you start the vitamins, maybe even just take multivitamins just now as pregnacare ect can be a bit expensive and if your not TTC till december itll cost ya! Then a month or so before you offically TTC switch to pregnancy vitamins and slow down on drinking ect!