If your last period was may 20th and baby born on march 12th what day did you get pregnant?

June 3rd.

Count 3 months back from March 12th (your baby’s due date) to get to December 12th. Then count back 14 days from December 12th to get to November 28th. This is the day you most likely ovulated. Your fertile window is the 5 days leading up to ovulation, so you got pregnant sometime between June 3rd and June 7. Add 280 Days to Last Menstrual Period Date: June 17, 2022 (May 20, 2022 + 280 = June 17, 2022). So, based on the provided information, your last menstrual period was on May 20th, and you gave birth on March 12th, which means the estimated day of conception was June 3rd