About 2 years ago I got advice from everyone here when a small gray cat turned up at mine and everyone here confirmed she was pregnant. She has permanently moved in now and has even survived a house move with us. We even kept one of the kittens. Just in case anyone remembered was feeling nostalgic so thought I'd update.
Kitten is now a fully grown cat and loves cuddles with resident old cat (who is 14 this year)
Can't find original post but thank you to everyone who helped.