Just under a third of pregnancy-related deaths occur during pregnancy. Another third happen during delivery or in the following week. But that final third occurs anywhere from one week to one year after the birth, largely due to cardiomyopathy and other cardiovascular conditions. Emily Peterson, the lead author on the CDC report, explained on a press call that this group includes two distinct pools of people. One is those who already had a heart issue that pregnancy exacerbated, and the other is those who had no problem before giving birth but developed heart issues as a consequence of their pregnancy.