I have my tongue pierced and the bottom ball touches the web of my tongue too. At first, my tongue web was a little sore from it as I was getting used to the piercing, but then it went away and now I don't feel it anymore. I would say give it some time, and after the swelling has gone down completely, if the ball has started or continued to irritate to your tongue web, talk to your piercer about it. If you're not feeling any pain there is likely nothing wrong.
I have 28 piercings, including a tongue piercing!