To drink or not to drink?!?

I need your help ladies... I’m 8dpo and this is my first month ttc after mirena removal. I took a test this morning which was neg, but I’ve had a few symptoms (which I could be completely making up of course). I’m at a friend’s housewarming tonight. Do I assume I’m not preggo and drink or do I make everyone suspicious by not drinking? They are our best friends and will definitely ask why I’m not drinking but I don’t really want everyone to know yet, what do I do??? Thanks!