What may change in your body
In general, there are still no reliable pregnancy symptoms. Sensations like cramps, bloating or breast tenderness can also happen in cycles without a pregnancy, so they don't confirm one.
Care for this week
Keep up safe habits for a possible pregnancy.
Don't rely on isolated symptoms to decide whether fertilization has happened or not.
If you need to take medication, check with a professional or pharmacist whether there's specific advice for when you're trying to conceive.
Prenatal care focus
- A test may still be negative even if fertilization has occurred, because hCG only rises after implantation.
If you're expecting twins
If two eggs are fertilized, dizygotic (fraternal) twins may develop; monozygotic (identical) twins result from a single embryo splitting at a later stage.
For those by your side
Try not to turn every physical sensation into an informal pregnancy test. Waiting for the right time to test usually reduces confusion.
Questions for this week
Can you feel fertilization?
There is no reliable symptom that lets you identify the moment of fertilization.
Can the test already be positive?
In most cases, it's still too early. hCG is only produced in detectable amounts after implantation.
When to seek care
- Vaginal bleeding during pregnancy should be reported to your care team; how heavy it is, pain and gestational age change how urgent it is.
- Severe, worsening or persistent abdominal pain deserves evaluation.
- Fever, fainting, significant shortness of breath, chest pain or feeling very unwell need medical care.
In an emergency, go to the urgent care service in your area. This content does not replace a professional assessment.
The next chapter
In week 4, implantation in the uterus may be underway and hCG starts to rise.
See week 4Was this helpful?
Sources and transparency
- Brazil's Ministry of Health — Brazilian Pregnancy Booklet, the official prenatal record (Caderneta Brasileira, updated in 2026)
- Brazil's Ministry of Health — Prenatal care (Ministério da Saúde — Pré-natal)
- Brazil's Ministry of Health — High-Risk Pregnancy Manual — Multiple pregnancy (Manual de Gestação de Alto Risco — Gestação múltipla)
- NHS — Week-by-week guide to pregnancy
- ACOG — How Your Fetus Grows During Pregnancy
Nilu editorial content, written from the official sources above. Individual clinical review of each week is in progress — this text is for information and does not replace your prenatal care.