Symptoms usually don't start coming until around the time a pregnancy test shows a positive, which is around two weeks past the act of unprotected sex.
Good luck on your quest to become pregnant! In any given month, a woman has a 25% chance of being pregnant. At 6 month its around 60%, at 9 months its 75%, after a year its 85%, and at 18 months its 90%.
You should start taking prenatal vitamins now, and if you drink or smoke you should also try to cut back a lot/stop now in the best interest of the baby.