Hi,
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If you want to stop with the Nuvaring use, you can take it out anytime. Before considering stopping with its use, visit your gynecologist/obstetrician for thorough evaluation to look for the underlying cause for the chest pain that you describe. If found to be due to hormonal effect of the Nuvaring, you will be asked to stop its use and consider alternate safer birth control measures. Take adequate rest. Drink plenty of water. Maintain healthy diet and lifestyle. Be in regular monitoring and follow-up with your treating doctor/gynecologist.
Take care.