A female can ovulate without being bred. She will either lay slugs or re-absorb them.
And to clarify further...once a female ovulates she will not resorb. Follicles can be resorbed, and the female will not subsequently ovulate, since there's nothing there to "move forward" with the entire process.

After ovulation, whatever is in there is coming out, whether fertile eggs, infertile eggs or little yellow immature ova (aka "slugs").



K~