Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services if you develop new or unexplained chest pressure, squeezing, heaviness, or pain that lasts more than a few minutes, returns repeatedly, or occurs at rest.
Do the same for sudden breathlessness, fainting, cold sweating, or chest discomfort with nausea or pain spreading to the arm, back, neck, jaw, or upper abdomen.
Symptoms can be less intense than expected, and it is safer to be assessed promptly.
Arrange a routine medical appointment if you notice repeatable chest discomfort or breathlessness during activity, an unexplained decline in stamina, or recurring symptoms that settle with rest.
Earlier review is also appropriate if established angina becomes more frequent or is triggered by less activity.
Continue routine follow-up if you already have coronary disease, even when you feel well.
This allows risk factors, medicines, and any change in symptoms to be reviewed.
The article also says
Do not drive yourself if a heart attack may be happening.
Every sign above is quoted from the sofidex article on Women and coronary artery disease. If you are not sure, err upward — it is always reasonable to be checked.