| American College of Obstetricians and Gynecologists | BabyCenter - When can I take a pregnancy test? In: Before We Are Born: Essentials of Embryology and Birth Defects |
|---|---|
| : American College of Obstetricians and Gynecologists; 2015 |
| Initial prenatal assessment and first-trimester prenatal care | Overview of the etiology and evaluation of vaginal bleeding in pregnant women |
|---|---|
| FirstCry - Pregnancy Symptoms After Missed Period — Am I Pregnant? NCBI: National Center for Biotechnology Information, U |