Im really scared and i wanted to find out, if i can still get pregnant when my period came on the day after i had sex and took plan be the morning of?

A fertilized egg, from previous unprotected sex during ovulation couldn't adhere to the uterine lining during a menstrual period with normal bleeding going on. Your next period should occur on time as long as you don't have unprotected sex during the cycle.

In that setting, I haven’t had your period is most likely a sign that you are not pregnant. If your period is late, however, you should do a home pregnancy test. You are probably going to be OK, but you should be safe. Practice safe sex. Good luck.