What should I do?!

So I found out I was pregnant on Tuesday, I am not 5 weeks and 2 days, I’m 16 and I’ve been with my boyfriend for almost three years, he will support whatever decision I make but I’m just not sure what to do? I have told my mum but I’m so unsure, do I keep the baby? Or do I get an abortion and wait until I’m older? What would you advise me to do?