Finally my oldest histrix got nailed by the male, and here is a clip where you can see the movement in her belly. This was over a month before she gave birth.
Near midnight 16.11.16 she gave birth to a wonderful little female. I have been waiting for this moment for about 6 years, so i am obviously extremely excited.
The mother still have pups waiting to be born, so far this is the only one that have popped out. I have removed the pup from the main tank, and put her in a smaller tank (115 liter) with sand, roots and plants. I will post updates later.
Here is a picture of the 1. born,-
Reminds me of her mother when i bought her in Germany years ago, with the dark areas on her body.