Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Seek emergency care for:
Contact the treating clinician promptly for new or steadily worsening shortness of breath, reduced activity tolerance, palpitations, swelling, chest discomfort, or fainting.
Fever, chills, night sweats, or persistent unexplained fatigue also deserve timely medical review, especially after a recent infection or procedure, because they can occur with endocarditis.
Follow-up usually includes symptom review, blood pressure checks, physical examinations, and repeat echocardiograms.
More frequent monitoring may be needed when regurgitation is severe, the left ventricle is changing, the aorta is enlarged, or new symptoms appear.
The article also says
Keep track of changes in exercise capacity.
Becoming short of breath on a familiar walk, needing more pillows to breathe comfortably, or developing new swelling may be more useful than judging a single difficult day.
Pregnancy increases the amount of blood the heart must pump.
Anyone with moderate or severe aortic regurgitation, an enlarged aorta, or a previous valve procedure should discuss pregnancy planning with a cardiology and obstetric team.
Every sign above is quoted from the sofidex article on Aortic regurgitation. If you are not sure, err upward — it is always reasonable to be checked.