I think it is worth contacting a few universities now for their opinion (you might need to try a few). Will they be surprised that you are taking an access to law course? Was it done purely to gather information about the subject to see if it would interest you, because why not apply direct to universities with your A levels? Science A levels are fine for law, so were you told that you needed evidence of recent study? Re medicine, have you applied in the past and, if so, were you offered a place? And have you spent the intervening time (or recent years/months if it is a newish idea) gathering information and working in a related field? Universities will be intrigued as to why now, so if you do get in touch with them, you might even be asked that informally.