The easiest way to find out if she is pregnant is to wait. I tried the breeding thing for a while, thinking it would be so much cheaper to feed my snakes. I had to give most babies away to pet store. Rats are notorious for continual breeding, and can get pregnant every 3-4 weeks. The best thing is to just put your male and female together and leave them. You will have more rats than yuou know what to deal with in a maatter of a few months. Also, I worked at a pet store for a while, and whenever we wanted our mice and rats to breed, we would feed them(as a snack)small dog biscuits broken into 2-5 pieces. Not sure why, but it would cause them to begin breeding faster.
Good Luck!
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