Is A Long Menstrual Period Cause For Concern?

Im on the pill and recently stopped for my monthly period. However when I went to start my pill again I realised I didnt have another packet so had to wait another week to get a new one. Basically I hadnt taken it in 2 weeks then suddenly after I another period in the space of two weeks. This one is very heavy and seems to be lasting a lot longer than my usual ones, its now been a week and it still hasnt stopped? Is there anything I should worry about?