I hope you are not keeping your male and female betta together in the main tank? They need to be carefully conditioned and ready to breed before they are put together in the spawning tank, and even then you might want to keep an eye so he doesn't beat her up.
Breeding bettas is not like breeding guppies, it takes quite a bit of planning, and a certain amount of financial outlay. Have you got a big enough growing out tank for the fry, and the space to separate the male fry as they grow up, and an outlet for your new bettas? Are you aware that they can have hundreds of fry?