Monica getting pregnant

Towards the end of the show, it was pretty apparent that Courtney Cox was pregnant in real life. To make that less obvious, the ending of FRIENDS could have been altered by making her character, Monica Geller-Bing, pregnant in the reel life. Chandler at one point during the show says he wants four kids, one boy, twin girls and another boy. Moreover, it had never been said that Monica and Chandler can never get pregnant. The doctor had said that they could keep trying but there was a good chance it may never happen. Hence, it wouldn’t have been a contradiction to the plot even if that had happened at the end.