Are you talking about https://meredithlmick.wordpress.com/ which only has one post or another WordPress.com site? Do you see the ads whilst you are still logged in? That could mean that your browser has an adware infection.
If you see adverts on a WordPress.com site when not logged in then you must have a free plan where WordPress.com can place adverts. The solution then is to upgrade to a paid plan to remove the ads. https://en.support.wordpress.com/no-ads/