Sources
- CSGB / Asgari Ücret Tespit Komisyonu (2026 brüt/net)
- GİB gelir vergisi tarifesi 2026
- EPDK mesken elektrik kademeli tarife (yaklaşık)
- BOTAŞ / dağıtım şirketleri doğalgaz (yaklaşık)
- Hazine ve Maliye — kıdem tazminatı tavanı 1. dönem 2026
Pregnancy Due Date Guide
Track gestational week and an estimated birth window; do not treat the date as exact.
Forty weeks from LMP
The standard estimate adds about 280 days to the first day of the last menstrual period. It dates clinical gestation rather than exact conception and is for planning, not diagnosis.
Cycle-length adjustment
The usual method assumes a regular 28-day cycle. Longer or shorter cycles can shift the calendar estimate. Irregular cycles raise uncertainty and make early ultrasound more important.
Ultrasound and clinical dating
Early measurements can revise dating. When LMP and ultrasound disagree, follow clinical judgement rather than averaging at home.
A window, not a single day
Birth rarely occurs on one exact predicted day. Bleeding, fluid loss, severe pain or reduced movements require clinical care, not a calculator.
Trimesters and appointments
Week number guides screening schedules. Note obstetric weeks separately from casual “month” language.
Special situations and limits
Multiple pregnancy or assisted conception may follow different plans. This guide is informational and not personal medical advice.
IVF and known transfer dates
Assisted reproduction may date pregnancy from retrieval or transfer rather than LMP. Do not force the standard calculator; use the clinic’s gestational age.
Working with appointment calendars
Write both calendar date and obstetric week on reminders. Screening windows are week-based and shift if dating is revised after ultrasound.
Practical tips
- Use the first LMP day.
- Enter cycle length when known.
- Keep early ultrasound records.
- Read the due date as a window.
- Seek care for warning symptoms.
- Prefer clinic dating after IVF.
- Store both calendar date and obstetric week.
FAQ
Is the due date exact?
No. It is an estimated centre of a birth window.
What if cycles are irregular?
Uncertainty rises; clinical dating becomes more important.
Which date wins if ultrasound differs?
The clinician’s dating decision for follow-up prevails.
Why 280 days?
It is the common 40-week obstetric model from LMP, not conception day.
Is this medical advice?
No. It is informational planning support only.
Does IVF use the LMP formula?
Not always. Transfer dating from the clinic should prevail.
Why note weeks and dates together?
Screening windows follow obstetric weeks that can be revised.