Conceive Date Based On Due Date Does The Conceiving Date Determin The Due Date?

Does the conceiving date determin the due date? - conceive date based on due date

My husband and I are planning a baby, the anniversary of our son in September, so do not want the child was also born in September. So I asked myself if the time limit to deal with in the design or if the expiration date is the day of my blood ummm period not to conclude that new opportunities to a baby? I do not know techniqual a concept that I forget what it's called