If i got my period a day after unprotected sex w/o ejaculation, means i won't be pregnant right?

Correct: a period means no pregnancy 99% of the time

Right: If a woman has her normal, regular menstrual period, that means she is not pregnant at that time. If not wanting to be pregnant, always avoid sexual activities or always use a reliable form of birth control. If a regular period does not come (is late), then she can do a urine pregnancy test a few days after a period is late.