https://www.sciencedaily.com/releases/2022/11/221129112845.htm

Published in The American Journal of Drug and Alcohol Abuse, the peer-reviewed research shows pregnant women were around 4.6 times more likely to report using cannabis, where it is legal for medical and recreation, compared to where CBD is only allowed.

A large proportion of women reported using the drug for medical purposes, which is in keeping with "a growing body of evidence" that suggests in order to alleviate pregnancy symptoms cannabis is being used as a substitute for medical drugs in legalized areas.