Ella?

So my boyfriend and I had sex and we haven’t been using protection... he has came In me multiple times over the past 3 days... we thought we wanted to try and have a baby at the moment but we have been thinking about our future and our ages and how we don’t want to have a baby until we are both completely ready. It is past the 72 hours for a plan b but I have read online about something a doctor can prescribe called Ella within a 5 day period. I was just wondering if anybody has ever had this prescribed before if it worked and what kind of doctor can prescribe it... I was also wondering that if I need a parent to go with me ( I am 17) or can I just bring my health insurance card? Also I would really appreciate help or answers to my question but I don’t really want to hear about your opinions on teen pregnancy, thanks.