follicular phase

https://doi.org/10.1351/goldbook.10733

First half of the human menstrual cycle, during which one or more follicles in the ovary may mature, culminating in ovulation.

Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 757 [Terms] [Paper]