"Antenatal courses are for groups of expectant parents who usually attend during their third trimester," says Val Willcox, practice manager at the National Childbirth Trust (NCT). The third trimester begins around week 28 of pregnancy and lasts until you give birth, which is often around week 40 of pregnancy.
This is a companion discussion topic for the original article at https://patient.info/news-and-features/what-do-you-learn-in-antenatal-classes-and-how-can-they-help-with-childbirth