The correct answer is Puerperium.

Lochia is the vaginal discharge from the uterus after childbirth, coming from the healing placental site and shedding decidua. It is discharged during the puerperium (about 6 weeks), changing from rubra to serosa to alba.

Menstrual flow is not called lochia, there is no lochia during pregnancy, and lactation is breast milk secretion - although lochia may increase briefly during breastfeeding, it belongs to the puerperium.

Short trick: Lochia = puerperal discharge (rubra - serosa - alba).