You'll want to wait at least until the first day of your missed cycle-and perhaps a bit longer. Heres why. Home pregnancy tests measure a hormone produced after the fertilized egg attaches to the wall of the uterus. This hormone, called HCG, isn't present until 6 to 10 days after frtilization. Timimg varies, so testing to early might miss a developing pregnancy.
2 to 3 weeks after the unprotected sex, with a home pregnancy test.
With a blood test, 1wk after intercourse....that's when i did mine...it will not show that early in a urine test.