I’ve been taking destrogel for 3 years: having little bits of brown and red blood for about 3 weeks

Hi I’ve been takin destrogel for 3 years with no periods but I’ve been having little bits of brown and red blood for about 3 weeks my smear test is clear also I’ve got no pain or smell and I’m 48 please could someone try to give me some answers as I’m very worried and scared