ALISON STEWART:

In her early 20's, Sheena says she stopped using opioids when she met her boyfriend. At 24, she became pregnant. And during a difficult childbirth she was given intravenous Fentanyl, an opioid painkiller, by a doctor who didn't know about her addiction.

Discharged with a prescription for another opioid painkiller, Percocet, she relapsed. Sheena continued using opioids for the next three and a half years. Even when she and her boyfriend found out she was pregnant again.