answer:Google doesn’t track what you actually buy, at least not in the way you’re talking about. They may report “conversions” to the website owner if they’re set up for that, and they’ll track your purchases through Google Checkout for you to view later, but as far we know, Google doesn’t actually track your purchases for anything related to their search ads. So, you’d still see the ads even if you made the purchase after clicking the ad and with Google Checkout.