Could i be pregnant ? had unusual cramps(left abdominal ) 4 days before period then fainted(almost never happens) and had unusual light period ??

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), or 1 week after missing a period. An Ob-Gyn doctor can evaluate any persistent or worrisome symptoms.

If that light: period was actually spotting - then pregnancy is possible. Take a home pregnancy test to know.