They cannot get pregnant. They are egg layers...
Right now I suggest not having them together. Place them into their own tanks with their own heaters... Heat the tanks to 78-80 degrees and start on your 2-4 week conditioning. Conditioning allows both to be willing and ready. Exercising can be done with a mirror which is mentally and physically good for them.This should be done daily for a few minutes (5-15). Feeding them a good variety of food, at least 3 times a day encourages their instincts (enough food for fry mentality). Isolate them from each other's views, smells, etc.
Clean, warm water is also a must. Sick fish won't (or should not) breed. Also make sure you have a grow out tank (30+ gallons minimal), the spawn tank, and two tanks for the male and the female to remain separated.