Morning Sickness: This is the most common cause of nausea and vomiting (N/V) in pregnancy, often accompanied by mild pelvic discomfort due to implantation or early pregnancy changes. It typically occurs in the first trimester.

Urinary Tract Infection (UTI): UTIs can cause pelvic pain and may lead to N/V due to the infection or associated pyelonephritis. Pregnancy increases the risk of UTIs due to urinary stasis.
Ovarian Cyst: Ovarian cysts can cause pelvic pain and, if they rupture or torsion occurs, can lead to severe pain and potentially N/V.
Preterm Labor: Preterm labor can present with pelvic pain and may be accompanied by N/V. It's a significant concern due to the potential for premature birth.

Ectopic Pregnancy: Although less common, ectopic pregnancy is a life-threatening condition that can present with pelvic pain and N/V. It requires immediate medical attention.
Placental Abruption: This condition involves the placenta separating from the uterus and can cause severe pelvic pain and N/V. It's an emergency that can threaten both the mother's and fetus's lives.
Appendicitis: Appendicitis can occur during pregnancy and may present with pelvic pain and N/V. Its diagnosis can be challenging due to the changing anatomy during pregnancy, but it requires prompt surgical intervention.

Molar Pregnancy: A rare condition where a non-viable fertilized egg implants in the uterus, leading to severe N/V and pelvic pain due to the rapid growth of the uterus.
Pregnancy-related Thrombophlebitis: Inflammation of veins due to a blood clot, which can cause pelvic pain and potentially N/V if the clot is large or in a critical location.