Should i still go to referall for breast scan

Hi there I hope this posf is ok, im breastfeeding my little one but I found a lump that did not go away for over a week. I went to the GP who referred me to a scan but now I think the lump has gone. I don't want to take a scan appointment and waist the time where someone who might really need it can go instead you know. Should I still go and be on the safe side? Has anyone had this happen before?