TTC and quitting…?

So hubby and I are TTC for our last…. And since I had my youngest 5 years ago I’ve become a multiple times daily regular smoker rather than just 3-4 times a week. Previously I always just quit when I got a positive pregnancy test and never had issues. But I’m worried since I smoke more now that I wouldn’t be clean by my 8 week appointment…? Should I just quit when I hit my TWW? I worried I’d miss it extra then 🤣 Any one have any insight or similar situation?