Pregnancy Calculator Singapore - Pregnancy Week Calculator

Last Menstrual Period (LMP) Method:

• Most Common: Standard method used by healthcare providers
• 40 Weeks: Pregnancy calculated as 280 days from LMP
• Ovulation: Assumes ovulation occurs 14 days after LMP
• Accuracy: Works best with regular menstrual cycles

Conception Date Method:

• 38 Weeks: Pregnancy calculated as 266 days from conception
• More Precise: If you know exact conception date
• IVF Pregnancies: Often used for assisted reproduction
• Ovulation Tracking: Based on fertility awareness methods

Due Date Method:

• Reverse Calculation: Works backward from known due date
• Ultrasound Dating: Based on early pregnancy scans
• Medical Adjustment: When LMP method needs correction

First Trimester (Weeks 1-12):

• Week 4: Missed period, pregnancy test positive
• Week 6: Heart begins beating, morning sickness may start
• Week 8: Major organs forming, embryo becomes fetus
• Week 10: All vital organs present
• Week 12: End of first trimester, miscarriage risk decreases

Second Trimester (Weeks 13-26):

• Week 16: Gender may be determined via ultrasound
• Week 18-20: Anatomy scan, baby movements felt
• Week 20: Halfway point, detailed anomaly scan
• Week 24: Viability milestone, baby could survive outside womb
• Week 26: Eyes begin to open, rapid brain development

Third Trimester (Weeks 27-40):

• Week 28: Baby's lungs developing, regular movements
• Week 32: Bones hardening, baby gaining weight rapidly
• Week 36: Baby considered full-term if born after this
• Week 37-40: Full-term period, baby ready for birth
• Week 40: Due date, though normal delivery can be 37-42 weeks

Maternity Leave:

• Duration: 16 weeks for citizens and PRs
• Payment: Full salary for first 12 weeks, 50% for last 4 weeks
• Flexibility: Can be taken before and after delivery
• Adoption: 12 weeks for adopted children under 12 months

Paternity Leave:

• Duration: 2 weeks for fathers
• Timing: Must be taken within 16 weeks of birth
• Payment: Full salary paid by government
• Adoption: Also applies to adoptive fathers

Baby Bonus Scheme:

• Cash Gift: $8,000 for 1st child, $10,000 for 2nd child
• CDA Account: Co-savings account with government matching
• Tax Relief: Qualifying child relief and working mother relief
• Medisave: $3,000 Medisave grant for newborns

First Trimester Screening:

• Combined Test: Blood test + nuchal translucency scan (11-13 weeks)
• NIPT: Non-invasive prenatal testing for chromosomal abnormalities
• CVS: Chorionic villus sampling if high risk (10-13 weeks)

Second Trimester Screening:

• Anomaly Scan: Detailed ultrasound at 18-22 weeks
• Glucose Test: Gestational diabetes screening (24-28 weeks)
• Amniocentesis: If indicated by earlier screening (15-20 weeks)

Third Trimester Monitoring:

• Growth Scans: Monitor baby's growth and position
• Group B Strep: Screening at 35-37 weeks
• CTG Monitoring: Cardiotocography for high-risk pregnancies

How accurate is the pregnancy calculator?

The calculator is accurate for women with regular cycles. Ultrasound dating in early pregnancy (before 12 weeks) is considered most accurate.

When should I see a doctor in Singapore?

Book your first antenatal appointment by 10-12 weeks. Earlier if you have medical conditions or pregnancy complications.

What if my cycle is irregular?

For irregular cycles, conception date or early ultrasound dating may be more accurate than LMP method.

Can I change my due date?

Due dates may be adjusted based on early ultrasound measurements, especially if there's a significant difference from LMP dating.

What pregnancy care is covered in Singapore?

Citizens and PRs receive subsidized antenatal care at public hospitals. Private care is also available at higher cost.