Not necessarily.
1) - BPs can retain sperm. So, since your female has been with a male since before she started building, it is possible she is already storing enough sperm to get the job done.
2) - Fertilization takes place at, or very shortly after, ovulation, just like with humans. If your female is still building, you should be fine. From what I've heard, they won't lock after they have ovulated, so it sounds like she is still building.
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