Bleeding Gums After Laser Teeth Whitening

I had Polus laser whitening at 10am yesterday morning and my teeth were really sensitive afterwards. My gums were also white for about an hour after. This morning, although the sensitivity in the teeth themselves had reduced, my gums are really sore and bled an awful lot when I brushed my teeth. I'm terrified that this may be lasting damage. Is there anything I can do to alleviate the bleeding? Thanks. Lou, Manchester UK.