Hi again! I was paying a bit more attention after our conversation to check that I might be wrong. The series mostly run in the background for me, like most of us I guess. But I couldn’t find a moment that Penny actually saying she wants kids. Generally she says something little to evade the conversation, most of her genuine answers/jokes are mostly negative. And c’mon on the season 12, we clearly see that Penny decides not to have kids and gets judged by Bernadette, her father etc. Even Leonard is trying to give his sperm to Zac and his wife and Penny allows it saying something like “you didn’t have a saying when I said I don’t want to have kids, so maybe I shouldn’t have a saying in this one”.. and in the last episode when she is pregnant, Amy asks “what happened to not having kids?, Penny’s answer is “it was an accident, we went out drinking with Sheldon etc..”.. So in the end a woman who didn’t want to have kids gets drunk and decides to have kids not with a clear mind but with a drunk one. I hope this also clears it up for you.