She is building for ovulation. If you don't put a male in with her you'll probably get slugs. January is a long time ago and the stored sperm maybe good but it maybe not good either. If you have a male put him in with her. If not you'll get what you get.
There is no connection to when a female was bred to when she ovulates. I average about 50% of the females that breed produce eggs. So, if you want to produce 20 clutches a year it's a good idea to have in around 40 females to do that.
Corey