I have had two pair of rats for about 3 months now. They have been mating every 5 days, but i have yet to see any signs of pregnancy . What signs in particular should i be looking for for pregnancy? Also my setup is a 40gallon tank with aspen and like five hides for them. A water bottle and i feed them, (i switch it up everyday) rat mix food from petsmart,dog food, cheerios, brocolli, carrots, celery, all kinds of rat treats. We spend a lot of money on them. What am i doing wrong? Or am i? Please help