I am 28 weeks and I am due on November 22 2013 it shows I prob conceive on march 1st does that mean the sperm went in and produce or I been pregnante please help I don't understand

It takes a sperm and an egg to become pregnant it means that a sperm met the egg at some point in March depending on what formula you use to calculate it.

Conception dates are guesswork! You can't know exactly what day you got pregnant, unless you only had sex once and know what day it was (and even if you had sex one day, the sperm has as much as 3 days to get to the egg).

Conception dates can be as much as 2 weeks off, plus or minus.