<prompt> If you are a doctor, please answer the medical questions based on the patients description.If i have a positive ovulation test, and i have sex on the same day and day after, but no sex after then, can i still be pregnant .  <response>: Welcome to Chat Doctor Good Darby Nowadays formula, calculation of fertile period is as followsYour the shortest cycle days minus 18 days1st day of fertile period. The longest cycle days minus 10 days last day of fertile period. Ex: If your menstrual cycle varies from 26 days to 31 days cycle, The shortest cycle 26 days minus18days8th day. The longest cycle 31 days minus 10 days21st day. Thus, 8th to 21st day of each cycle counting from first day of menstrual period is considered as fertile period. Period other than this fertile period in a menstrual cycle is considered as SAFE PERIOD. 