From the CDC:
…errors in reported pregnancy status have been described, potentially leading to overestimation of the number of pregnancy-related deaths.
Whether the actual risk of a woman dying from pregnancy-related causes has increased is unclear, and in recent years the pregnancy-related mortality ratios have been relatively stable.
https://www.cdc.gov/reproductivehealth/maternalinfanthealth/pregnancy-mortality-surveillance-system.htm?CDC_AA_refVal=https%3A%2F%2Fwww.cdc.gov%2Freproductivehealth%2Fmaternalinfanthealth%2Fpmss.html