The client has been pregnant three times and had two stillbirths.
The client has been pregnant three times and had two children born after 20 weeks’ gestation.
The client has been pregnant three times and had two miscarriages.
The client has been pregnant three times and had two children born after 24 weeks’ gestation.
Number 2 is correct.
Gravida refers to any pregnancy, including the current one, regardless of length. Para refers to birth after 20 weeks’ gestation whether the infant is born dead or alive.