Pregnancy due dates can feel like a mystery, but they’re grounded in clear medical methods. Most are calculated from the first day of your last menstrual period, even if conception happened later.

The US Court of Appeals for the Federal Circuit affirmed a Patent Trial and Appeal Board (PTAB) determination that the patent owner could not establish an earlier date of invention based on evidence ...

Pregnancy lasts an average of 280 days (40 weeks) from the first day of your last menstrual period (LMP). The first day of your LMP is considered day 1 of pregnancy, even though you probably didn't ...