Conception Calculator — Week 11 From Conception (Fetal Age)
You are 11 weeks from conception, which corresponds to 13 weeks of gestational age (LMP-based). This page focuses on true fetal age — how long the baby has actually been developing since fertilisation.
Conception Calculator
Enter your LMP. Fetal age = gestational age − 2 weeks.
Baby at week 11
At 11 weeks from conception (13w gestational): Fetal breathing movements begin as diaphragm develops. Head is still half of body length. Fingers unwebbed; can open and close.
Mother's body — what changes
11 weeks post-conception, your body is: Nausea usually starts easing. Areolas darken. Linea nigra may appear on abdomen.
Nutrition & supplements
Focus on folic acid 400–600 mcg/day (neural tube), iodine 150 mcg, and small frequent meals to counter nausea. No extra calories yet — normal maintenance intake is adequate. Week 11 from conception (13 weeks gestational) needs targeted micronutrients — the developmental window differs from LMP-based advice.
Safe exercise
150 minutes/week of moderate activity — brisk walking, stationary cycling, prenatal yoga. Stop any exercise that leaves you unable to hold a conversation. At 11 weeks from conception, low-impact activity supports placental blood flow without stressing the fresh implantation.
Doctor visit checklist — week 11
- ✓NT scan (nuchal translucency) window: 11+0 to 13+6 weeks
- ✓Note: 11 weeks from conception = 13 weeks LMP — clinic dating uses LMP
- ✓Confirm dating with crown-rump length at 8–13 weeks (±5 days accuracy)
Warning signs — call your provider immediately
- ⚠Heavy bleeding (soaking a pad in an hour)
- ⚠Severe abdominal pain that does not ease
- ⚠Fever above 38°C / 100.4°F
- ⚠Sudden loss of pregnancy symptoms + spotting
- ⚠Severe one-sided pain (ectopic pregnancy signal)
Week 11 — Frequently asked questions
How accurate is the Conception Calculator at week 11?
The calculator uses standard gestational-age arithmetic (LMP + 280 days for standard; egg retrieval + 266 days for IVF day-5). Ultrasound crown-rump length between weeks 8–13 is more accurate (±5 days) than LMP — adjust EDD accordingly if the scan differs by more than 7 days.
What size is my baby at week 11?
Approximately the size of a fig — length 4.1 cm and weight 7 g. These are median values from ACOG dating criteria and Mayo Clinic conception timeline references.
Which symptoms are normal in week 11?
Nausea usually starts easing. Areolas darken. Linea nigra may appear on abdomen. Every pregnancy is different — call your provider if anything on the warning-signs list appears.
Should I have an ultrasound at week 11?
NT scan (nuchal translucency) window: 11+0 to 13+6 weeks. Routine scan windows are: dating (10–13w), anatomy (18–22w), growth (28–32w).
How much weight should I gain by week 11?
Approximately 1.6 kg cumulative if you started at a normal BMI (IOM guideline). Underweight mothers gain more; overweight mothers less.
11 weeks from conception is how many weeks pregnant?
11 weeks from conception = 13 weeks gestational (LMP-based). All clinical care uses LMP dating unless IVF or dating scan overrides.
Can I feel conception happening at week 11?
No — conception itself is not felt. Later pregnancy symptoms are hormone-driven, not conception-related.
Content aligned with ACOG dating criteria and Mayo Clinic conception timeline. Reviewed by Dr. Maria Rehman, MD (OB/GYN). This page is educational and does not replace personal medical advice — call your obstetrician for any concern.