See your doctor. Make an appointment to see your doctor to discuss your concerns. There may be medical issues that can be evaluated and treated.
Keep track of it. Alzheimer's has a slow, subtle onset. Impaired activities of life (managing finances and appointments) are a sign. Problems with judgement and concentration along with disorientation also occur. Risk factors include old age and a family history. If you are younger, you probably do not have it. Diet and exercise may help you. If the above signs pertain to you, you should see your doctor.