Table 1.

Collection time points for archived samples.

Treatment	Description	Sample Size
Premenstrual	Collected the end of the cycle before P implant removal	n = 10
Menstrual Phase	Day 3 after P implant removal, active menstruation	n = 4
Proliferative Phase	Treatment with E2 alone for 14 days	n=10
Secretory Day 1	1 day after P insertion	n = 4
Secretory Day 3	3 days after P insertion	n = 5
Secretory Day 7	7 days after P insertion	n= 5
Levonorgestrel (LNG)	28 days of E2 plus LNG capsule	n=4