Tullips! Congrats on day 9! We all have our different approaches, but this one works for me: I tell them the truth. "It's not good for me. I'd like you to respect that simple answer and leave it at that. K?" If they push it any further than that, walk away gracefully. You'd be surprised how many "friends" ultimately respect that.
That said, you're so early in sobriety the best thing to do may be to simply stay away from the drinking friends for a while.