Wrong A-Level subjects

So when I chose my subjects I had a completely different career path in mind which isn't possible anymore. Because of that, my family have told me to go into working in anatomical pathology. I've worked really hard and my predicted grades are high, so meeting the grades needed for university won't be a problem. However, I currently have psychology, history and English. No biology.

I purposely didn't take biology because I didn't think I'd need it for the course I wanted to do, but here we are. I'm now really freaking out because naturally I'm thinking I won't get into anywhere when I come to apply, and I really need to go to university. I can't afford to redo A-levels. Please help!