Lots of offers will still be going out - the last offers will be made in April/May - so it doesn't mean you wont get an offer.
Yes, applications are ranked and offers are made as they go down the list, but this doesn't mean that Bristol wants you any less than someone else they have already made an offer to. Like all top Unis they get thousands more applications than they have offers and places, and they will now wait to see what the pick-up of Firm/Insurance is to see how many more offers they will make. This number juggling goes on right up to their May deadline.
An offer is an offer, they dont come in different colours or flavours. So hang on in there, keep your fingers crossed, and come back here and tell us when you get your offer.