Kementerian Kesehatan. https://promkes.kemkes.go.id/pentingnya-pemeriksaan-kehamilan-anc-di-fasilitas-kesehatan Diakses pada 13 Januari 2021What to Expect. https://www.whattoexpect.com/pregnancy/pregnancy-health/prenatal-testing-ultrasound/ Diakses pada 13 Januari 2021Ultrasonography. http://www.e-ultrasonography.org/upload/usg-19043.pdf Diakses pada 13 Januari 2021Web MD. https://www.webmd.com/baby/blood-tests Diakses pada 13 Januari 2021What to Expect. https://www.whattoexpect.com/pregnancy/pregnancy-health/first-prenatal-appointment/ Diakses pada 13 Januari 2021Ginekologia Polska. https://core.ac.uk/download/pdf/268475152.pdf Diakses pada 13 Januari 2021BMC Pregnancy and Childbirth. https://bmcpregnancychildbirth.biomedcentral.com/articles/10.1186/s12884-018-1800-7 Diakses pada 13 Januari 2021American Association for Clinical Chemistry. https://labtestsonline.org/conditions/pregnancy-first-trimester-12-weeks Diakses pada 13 Januari 2021Healthline. 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