Alcohol in conception limbo

On my second month ttc first baby with husband, never fallen pregnant before. Currently halfway through fertile window according to tracking apps and had a dip in bbt this morning but no lh surge for ovulation showing on opk yet. Doing all we can this month, baby dance at least once every day of fertile window, using pre-seed etc etc. Really hoping this will be our month.

Aunt Flo next due on 16th June. Husband is best man at his brothers wedding on the 10th and it's a whole weekend away from Thursday til Sunday. Not everyone knows we are ttc but I think they suspect and it will be expected that I will have a few drinks as it's a family celebration. It'll be too early to test whether we have conceived this cycle and I'm not sure what to do. If I abstain completely then family might get their hopes up thinking I am, will having a couple but not getting drunk be really detrimental within that limbo week after ovulation but before period due if we have managed to conceive? I know I should just say I don't want to because we are trying but I don't want people to think I'm trying to take attention away from my in laws' big day or anything? Is there anything I can do / any signs I can look out for to see if I have been successful in that week post ovulation? Sorry for long post and if I sound stupid it's just bothering me and I'm not sure how to handle the situation without telling everyone my business. Before ttc I wasn't a regular drinker but would tend to binge on family occasions and out with friends every couple of months. Thanks in advance xxx