Is spotting (1day)then cramping off/on (daily) then brown discharge(today) after sex a sign of pregnancy because i have unprotected sex ? is this normal? am i pregnant? could i gotten pregnant fast?

Hard to guess: It can be hard to tell if a woman is pregnant because some of the symptoms seen in early pregnancy can also happen in non-pregnant women. A urine pregnancy test gives a reliable result if done correctly. One can test about 3 weeks after sex (3 weeks after when conception might have occurred). An Ob-Gyn doctor can evaluate any persistent or worrisome symptoms.

Pregnancy : Anytime you have unprotected sex you can get pregnant. Do a home pregnancy test. Good Luck!