consistently about 4 weeks long, that day is usually about two weeks before you conceive. Related resources, pregnancy weeks and trimesters, explained, your pregnancy, week by week. Calendar PDF with Logo. Home other Calculators age Calculator, the Age Calculator can determine the age or interval between two dates. Pregnancy Week by Week, our complete pregnancy guide gives you expert info and advice about your growing baby and the changes in your body, by week and. Use this calculator as a days and time difference calculator. In this system, age grows at the birthday. Baby Names, finding the perfect name for your baby can be a big task. In one of the traditional Chinese age systems, people are born at age 1 and the age grows up at the Traditional Chinese New Year instead of birthday.