Saat paling awal mengetahui kehamilan biasanya terjadi ketika kita terlambat datang bulan. Padahal, ketika itu usia kehamilan sudah memasuki minggu ke-4. Karena perhitungan kehamilan dimulai dari hari pertama menstruasi terakhir. Pada saat menstruasi itulah rahim kita “dipersiapkan” atau “dibersihkan” dari telur-telur yang tidak dibuahi oleh sperma. Setelah proses perontokan tersebut selesai, dan sel telur kita berhasil dibuahi oleh sel sperma, maka terjadilah proses kehamilan yang paling awal.

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Just a week after fertilization, baby-making is still in its infancy, so to speak.  At 4 weeks pregnant, your body’s busily gearing up, big time.  Chances are you’re oblivious to all the hubbub — though some women experience those pesky PMS symptoms about now (mood swings, bloating, cramping — the usual suspects), others don’t feel a thing.  Whatever you’re feeling (or not feeling), you can’t be 100 percent sure that it’s pregnancy yet. It’s still too early to test.  But behind the scenes, here’s what’s going on:

The fertilized egg and your uterus are making contact this week. After completing its six-day journey through your fallopian tube, the blastocyst you’ll one day call your baby reaches its ultimate destination and begins to attach itself to the uterine lining.  About 30 percent of the time, implantation bleeding will occur as that bundle of cells burrows its way into the uterine wall.  Implantation bleeding, which is usually very scant and either light pink, light red, or light brown, occurs earlier than your expected period. Don’t mistake it for your period, and don’t worry about the bleeding — it’s not a sign that something is wrong.

As soon as the fertilized eggs implants, it starts to release hCG (human chorionic gonadotropin) — the pregnancy hormone that will very soon turn that line on your pregnancy test pink or blue and your world upside down. HCG alerts the corpus luteum (the once-follicle this egg was released from) that it needs to stick around and produce progesterone to nourish the pregnancy until the placenta takes over — about six weeks from now.

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