I've always had fairly light periods only lasting four or five days, but the past couple have been really heavy, flooding for the first couple of days then tapering off after a few more - a day or two of nothing and then a 'normal' period followed by a week of pale brown discharge, so three weeks in all.
Am getting concerned but don't want to tell GP as don't want to sound like a hypochondriac - I've had a few health concerns of late.