I got 4 rejections last year, but after re-applying I now have an offer now from Imperial.
Just use the year to prepare more for the BMAT/UKCAT. And improve your application, as there is now more time to get work experience, I even went abroad. Also, you have time to have a break from study and to earn some money that will be very helpful at university.
I didn't really want to take a gap year, but things have really worked out well, and now I'm glad I didn't get in the first time round.
Another thing to consider is how the different medical schools assess people, to increase your chances of an offer.
For now, just make sure you get your 3 A's so that you have this option. Good luck.