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Pregnancy Week Calculator

Calculate which week of pregnancy you are in based on the first day of your last menstrual period.

๐Ÿ‡ฉ๐Ÿ‡ฐ All calculations are based on Danish rules, rates, and currency (DKK). This calculator is translated for convenience but applies exclusively to Denmark.

Pregnancy Week Calculator

Knowing which week of pregnancy you are in helps you track your baby's development and prepare for upcoming milestones. Pregnancy is counted from the first day of your last menstrual period (LMP), even though conception typically occurs about two weeks later. A full-term pregnancy lasts 40 weeks (280 days) from the LMP.

Pregnancy Trimesters

Pregnancy is divided into three trimesters. The first trimester (weeks 1โ€“12) is when the baby's organs begin forming. The second trimester (weeks 13โ€“27) is often considered the most comfortable period, and you may start feeling the baby move around week 18โ€“20. The third trimester (weeks 28โ€“40) is when the baby grows rapidly and prepares for birth. Major check-ups in Denmark include the nuchal scan at weeks 11โ€“14 and the anomaly scan at weeks 18โ€“20.

Important Milestones

Key milestones include: week 8 (first heartbeat detectable), week 12 (end of highest miscarriage risk), week 20 (halfway point), week 24 (viability milestone), week 37 (full term), and week 40 (due date). In Denmark, you should contact your doctor (lรฆge) by week 6โ€“8 to begin your pregnancy care program (svangerskabskontrol). This calculator helps you keep track of exactly where you are in your pregnancy journey.

Frequently Asked Questions

How do I find out how far along I am?

Naegele's rule: Take the first day of your last menstrual period, add one year, subtract three months, and add seven days. This gives an expected due date 280 days (40 weeks) after the start of menstruation.

Which pregnancy week is the worst?

Nausea and vomiting usually start in weeks 5-6 and are worst in weeks 8-12.

When does the first pregnancy week start?

Week 1: You have your period this week and are not yet pregnant. It is still called the first week of pregnancy because the due date is calculated from the first day of the last menstrual period.

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