Well done on your results! Medicine courses are usually very competitive, but only a fraction of unis care about your GCSEs - and an even smaller fraction will actually have a lower limit. Those that do look at them will look at your application as a whole, with a much larger emphasis on your AS Level results and predicted grades.
If you want to check, go to the uni websites and find the course pages, where they'll list the course requirements. I know Cambridge applicants typically have 4-5 A* grades and the rest As, so you aren't too far off - if you ace your A Levels, I doubt these results will get a second look.