Your due date is calculated by adding 280 days (40 weeks) to the first day of your last menstrual period.
Gị atụmatụ ruru ụbọchị a gbakọọ site na-agbakwụnye 280 ụbọchị (40 izu) na ụbọchị mbụ nke ikpeazụ gị menstrual oge (anya isi a 28 ụbọchị okirikiri).