Yes, it is generally safe to take Tums (calcium carbonate) occasionally during pregnancy to relieve heartburn and indigestion. Tums provides fast relief by neutralizing stomach acid and also adds calcium, which is beneficial for both mother and baby during pregnancy. However, it is important to take Tums in moderation, following package instructions or your doctor's advice, and not to exceed the recommended dose (usually no more than 10-15 tablets in 24 hours depending on strength). Excessive use may cause side effects such as constipation, kidney stones, and interference with iron absorption. It is also advised to space Tums away from iron supplements by one to two hours. Lifestyle changes to manage heartburn are often recommended before relying on medications like Tums. Always consult your healthcare provider before starting any new medication during pregnancy.