When to tell

I live in a tiny town so even without posting on Facebook, news travels fast. I’m only 5+1 weeks but I’m feeling pressure to tell. My parents and SO’s parents know and both of our siblings. I’m hesitant to tell my close friends (particularly one) because I figure each of them will tell at least one person and I’m not telling my employer for a couple more weeks. I keep getting invites to hang out (which usually includes alcohol to some degree) and I can’t hold them off much longer. Any advice would be appreciated.