United States of Europe - History. 1  Various versions of the concept have developed over the centuries, many of which are mutually incompatible (inclusion or exclusion of the United Kingdom, secular or religious union, etc.).
Due Date Calculator. This interactive Due Date Calculator will help you estimate the date your baby will arrive. Pregnancy usually lasts 280 days (40 weeks) from the first day of the woman's last menstrual period.This calculator is a general guide: every pregnancy is unique, and sometimes babies arrive sooner or later than expected. Always talk to your health care provider about your due date.ertilization of the egg usually takes place 14 days before the woman's next period. If your menstrual cycle is shorter or longer than 28 days, select the number of days from the start of one cycle to the start of the next cycle.
Free on Android and iOS. Period Tracker Lots of apps predict your periodâs monthly due date. But Period Tracker doesnât base its projections on the standard, 28-day calendarâsince so few womenâs bodies actually adhere to it. Instead, it calculates the average length of your last three cycles, so it can more accurately predict the date your flow is going to show up.