Avoiding pregnancy

Hello! I'm Hanna & I am a 20 y/o college student who has recently become very sexually active with my partner. He busts in me every weekend. I am currently on the pill Loreyna and I am constantly anxious about getting pregnant. Any advice or suggestions? Is Loreyna a good brand? How likely is it for me to get pregnant? I've taken plan B twice in one month because I was so nervous. Any comments or messages will help me ease my mind about this or raise awareness for me!

Thank you!!