MIRA CONNECT Study

Inclusion Criteria for controls: * Non-pregnant Inclusion Criteria for cases: * Diagnosed with PUL requiring ongoing surveillance of serum hCG levels Exclusion Criteria for controls: * History of renal disease * History of type I or type II diabetes * Known malignancy of any diagnosis including hCG-secreting tumors (hepatobiliary tumors and neuroendocrine tumors) and ovarian germ cell tumors. * Gestational Trophoblastic Disease * Use of hormonal contraception within last 3 months * Patients who work the night shift Exclusion Criteria for cases: * History of renal disease * History of type I or type II diabetes * Known malignancy of any diagnosis including hCG-secreting tumors (hepatobiliary tumors and neuroendocrine tumors) and ovarian germ cell tumors. * Gestational Trophoblastic Disease * Unstable patient, concern for ruptured ectopic pregnancy * Initial serum hCG level \> 100,000 mIU/ml