to be honest thats really not looking that good. Most applicants will have AAB, though i think BBB offers have been given out in rare cases, but i think these offers are to people with tonnes of work experience. With only three weeks you cant even cover the variety of experience necessary. Where did you do you experience, and what uni's have you applied to?
Liverpool ask for a minimum of ten??? weeks work experience, and i think thats a sensible amount to aim for. This should include small animal, large animal, equine, kennels, exotic, lambing, dairy, generally as much variety as possibly.
You say you cant afford not to go first time round, but just work for a year and even try and save some, a lot of people have to do it, and if you're going to give up on veterinary at this stage then maybe you should consider if it really is the right career for you? Im not saying its not, but put some thought into because its a big decision