Popup Pro, how to only show pop up for Google Adwords

I'm trying to find a way to have a popup only show when someone comes to the site via a Google Adwords Link. I tried the "From a specific referrer" and used " website.com/?campaign=" and also just "?campaign=" but didn't seem to work. Also tried "On specific URL" and used "website.com/?campaign=" but still no luck. When any of the Google Ads running are clicked it will send to the site with the "?/campaign=" appended to it. There are multiple different campaign names so I was hoping to just be able to capture the "campaign=" part as the trigger for the pop up. Hope that makes sense! Thank you for any help.