Can I Get a Filling After I've Received my Invisalign Aligners?

Your Dr can do the filling then try in your aligner to make sure it fits. He can adjust the filling to match the aligner if he needs to so not to worry....

As long as the filling follows the contour of your original tooth, which it should, then your invisalign trays should fit fine after the filling is done. I would bring your invisalign trays to your visit for the filling and try it on after the filling is done, with your dentist still in the chair.  This will enable the dentist to adjust the filling and/or trim it down so that the aligner will fit. 

If the filling is very large or your require a crown it is highly likely that your aligners won't fit and then you will need to get new aligners made.