I had sex on 9th nov and i got periods on 18th nov.from nov30th till today iam feeling vomiting , dehydration and fainting.am i pregnant?

Had normal period?: A woman or girl who has her normal regular period is not pregnant at that time. She'll likely ovulate about a week or more after the end of her period. So, if a woman starts her regular period on the 18th, she might ovulate around the 1st or 2nd of the next month. If the next month's period doesn't happen, she can check a urine pregnancy test a week after missing her next period.