Help!

Emma

I'm 17 and worried that i am pregnant. Recently we had unprotected sex on the last day of my period and he did it inside me. and then there was no blood or anything and i took something similar to plan b but on the third day at night so the last minute. I go to a new gynecologist in less than a week.for birth control and I'm afraid I am and worried what my mom will do or say.