Maybe. The “sperm cycle” — how long it takes to produce new sperm — is about 3 months, so you will likely have to pause hormone therapy for at least this long in order to recover fertility. One study found that within 6 months of stopping estrogen therapy, 67% of subjects regained a normal sperm count. That means about 1 of every 3 trans women may be unable to recover their fertility after beginning a medical transition.