So here's the situation. I have Rindo as my concubine and by her portrait (the one that actually has her looking pregnant) and talking options she is obviously still pregnant but when talking to Kohaku about Rindo she speaks as if Rindo has already given birth. It might be because I have the fast pregnancy option turned on or because i turned it on a few ingame weeks after I got her pregnant but i'm no expert so I'll leave my assumptions there.