A 31-year-old Spanish woman is the first to become pregnant after having both ovaries removed, then receiving an ovarian tissue transplant.

The woman is currently eight to nine weeks pregnant, doctors reported in the British Medical Journal on Thursday.

The woman, from Barcelona, had both ovaries removed in 2001 because of tumours, Dr. Justo Callego of the Hospital Saint Joan de Deu said in the article. Part of one of her ovaries that was still considered viable was kept and frozen.

In July 2011, the woman told doctors she would like to have a baby, and so a graft of ovarian tissue was transplanted near her uterus.

Three months later, the woman had her first period in 10 years. Doctors then stimulated the patient’s ovarian tissue, which produced two mature eggs.

Those eggs were removed and doctors performed in vitro fertilization, where the eggs are fertilized in a lab setting, then transferred to a woman’s uterus.

“This is the first time in which (this procedure) is performed without (the patient) having any traces of ovarian tissue,” Callego wrote in the article.

The woman is due to give birth in July, Callego said.

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