Mom, pada minggu pertama kehamilan, embrio belum terbentuk. Proses yang terjadi pada minggu pertama adalah pembuahan (konsepsi) dan dilanjutkan dengan pembelahan zygote.
Menurut laman clevelandclinic.org., setelah zygote membelah dengan sempurna dan mencapai tahapan blastula, zygote akan bergerak menuju endometrium. Di endometrium itulah, proses implantasi terjadi. Apa itu implantasi?
Implantasi, atau biasa disebut juga sebagai nidasi, adalah proses melekatnya blastula dengan endometrium. Penyatuan ini tidak menghilangkan blastula, melainkan menyebabkan blastula terlindungi oleh endometrium.
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Saat implantasi, pertukaran hormon antara endometrium dan blastula memungkinkan blastula untuk masuk ke dalam endometrium. Hanya saja, saat proses ini, luka kecil yang diikuti dengan sedikit pendarahan mungkin terjadi. Pendarahan biasanya hanya terjadi satu hingga dua hari.
Setelah blastula menyatu dengan endometrium, luka yang disebabkan implantasi menutup. Lalu endomterium mulai menebal dan mulut rahim (serviks) dipenuhi oleh mukosa.
Blastula yang terselubungi oleh jaringan endometrium lalu menuju ke tahap plasentasi, yaitu saat terbentuknya plasenta.
Jadi Moms, pada minggu ke dua ini, janin masih belum berbentuk seperti manusia, melainkan bola atau gumpalan sel. Di minggu selanjutnya-lah embrio baru terbentuk.
Oleh: Sahirul Taufiqurahman
(vem/rsk)

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