Day6 of cycle had unprotected sex no ejaculation maybe preejauculation, sex same way on day17 took planb next day, still no period, am I pregnant?

Take a test. Home pregnancy tests are very accurate. They are the same tests used in a doctors office. They can detect a pregnancy 7-10 days after conception. The best time to take one is when you miss your period. If you doubt the result you can repeat it in 1-2 days. If you were pregnant the hormone level would rise enough for detection.