Bettas???Will Pick best answer always do?

I am breeding my betta and i introdulced her to his tank today using a floating breeder without the little V thing in it as i was advised to do By my LFS owner and everythings goin well i think.There both flaring at eachother.And she has her white spot that looks sorta like a pimple but hes not making a bubble nest.I Have a heater in it no filtration as it may dirupt the bubble nest. and a half cup for the guidleline for him to make the nest but still no nest..Does he make it then i introduce her???I know many of you will advise against breeding bettas but i am prepared have gotten together 300 plastic cups.have a 55 gallon growout tank am hatching Brine shrimp and have Frozen bloodworms as well as a variety of flake food.Can you tell me why no bubble nest thanks a billion:)