Can you still get pregnant from pre cum but you still get your period but it's a light period. the light period started a week after unprotected sex, no cum just pre-cum?

Not likely, and...: A urine pregnancy test, done correctly, gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and thus lead to a repeat test. If a woman gets her normal regular period, then she is not pregnant, and a test is not needed.