Please stop referring to the development time as a reason for if there should be a certain kink or not. MrKnobb is making all writing, graphics, music and sounds by himself while still having a full-time job to pay the bills and his electricity company has regular powercuts that don't help to feed his power hungry GPUs to render images. Also, when the story is planned for 20ish episodes in two seasons making them 10ish episodes long, there's plenty of time for bellies to grow. Up to now, each update (or episode) has had more content than previous and some of the content was not planned.
Since when all games/AVNs have to tell the player instantly that a swimmer reached its target? I have no clue how MrK is going to reveal impregnations. If he plans to go with this "99%" club, I'd say it doesn't seem to be a unique and creative way. And, since no pregnancy reveal has been made in the game so far, the kink is still in the planned category with approximately 12 episodes to go (in 3ish years if MrK keeps the pace and doesn't take any vacations).
If we talk about pregnancies, seems like it.

But I wouldn't say AE was a slow-burn. The MC can get his third leg wet in the second episode (the latest ep is #8).
PS. Before anyone starts to ask details from me, I don't know what exactly is going to happen in future updates. I'm just a part of his team to help with coding. And, because MrK isn't in this forum anymore, questions should be asked in his Discord server.