My last periods started on 16th Oct, and I had unprotected sex on 4th Nov bt it was of withdrawal types, I'm getting PMS bt having doubt of pregnany.

Don't have to guess. A urine pregnancy test gives a reliable result if done correctly the week after missing a period, or 3 weeks after having sex. If the test result is negative and a woman is still worried about pregnancy, she can do one more urine pregnancy test another week later.