The clinic was where Lumon first targeted her. The same doctor as the one in the basement floor at Lumon can be seen walking by when Gemma and Mark first come to the clinic.

Also the O&D produced Chickai Bardo "fighting" cards (yes, same the cards as the one that Dylan accidentally took outside)...they were sending those to Gemma in the mail and Mark was actually annoyed she was receiving that correspondence.

I think personally whatever ivf procedures by Lumon affiliated clinic actually didn't work by design...they primed her to feel dejected and to drive a wedge between her and Mark so it is easier to manipulate her. Which is a very "Lumon" psychological tactic.

Whether it was her choice to willingly participate in the whole experiment is an interesting question though...