Hi. Mi Name Is Larissa, I Am 18 Years Old.

Hi. Mi name is Larissa, I am 18 years old. Unfortunately I made I mistake yesterday, I had sex without protection. I have contraceptive pills but I forgot to take one the day before. As an impulse, I took 7 all together. My period had came but it left when I took the pills. I don't know what to do, I was virgin, and I don't wanna get pregnant. Now I don't knoe if it's safe to take the plan B pill or what. Help me please. Thanks