Until your adsense is approved any ads that show will go to Hubpages. If you want less ads you can change the settings in edit mode on your hub. In the top section is a button to change ad level - it's default setting is high.
To be honest I'd leave it as it is, otherwise when you do get your adsense approved you will have to go back through your hubs and change the settings back to high again.
Hope this helps!