Erin Heger, May 21, 2021

Implantation occurs during pregnancy when a fertilized egg attaches itself to the uterine wall. As part of this process, the body releases prostaglandin — a hormone that causes the uterus to contract, which can result in some mild cramping, says Kecia Gaither, MD, director of perinatal services at NYC Health + Hospitals/Lincoln. 

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