Yes: Tums (calcium carbonate) is the standard first-choice heartburn remedy in pregnancy, compatible within recommended amounts. The limits are about quantity: stay under the label maximum, because daily mega-dosing can overdo calcium and worsen constipation.
Needing more than occasional relief is the cue to step up, not dose up: OBs commonly add famotidine or another compatible acid reducer, especially in the third trimester when the uterus squeezes the stomach. The free fixes cut how many you need: smaller frequent meals, no late-night eating, skipping your triggers (fatty, spicy, tomato, chocolate, mint, coffee), staying upright after meals, and raising the head of the bed. Bonus: the calcium counts toward pregnancy calcium needs, though it is no reason to overdo it. The call-the-same-day pattern: heartburn with upper-right abdominal pain, headache, or vision changes in the second half of pregnancy, which is a preeclampsia check, not a heartburn problem.
What to do
Common questions
Can I take Tums while pregnant?
Yes: Tums is the standard first-choice heartburn remedy in pregnancy. Calcium carbonate neutralizes stomach acid on contact, acts locally rather than being absorbed in meaningful amounts, and MotherToBaby notes that when used as directed and within recommended amounts it is not expected to increase pregnancy risks. The caveats are about quantity, not the drug itself. Stay within the label's daily maximum: mega-dosing calcium carbonate daily can push calcium intake past safe upper limits, cause constipation (already a pregnancy complaint), and in extreme overuse cause a milk-alkali problem (too much calcium plus alkali in the blood). If you need more than occasional relief, that is the signal to step up rather than dose up: your OB can add famotidine (Pepcid) or another pregnancy-compatible acid reducer, which many pregnant people end up needing in the third trimester when the uterus is physically squeezing the stomach. The free fixes that reduce how many Tums you need: smaller and more frequent meals, skipping the late-night eating window, avoiding your personal triggers (fatty, spicy, tomato, chocolate, mint, coffee), not lying flat for a couple of hours after eating, and propping the head of the bed up. One useful side benefit, not a reason to overdo it: the calcium counts toward your daily calcium needs, which rise in pregnancy. And the when-to-call line: heartburn with upper-right abdominal pain, headache, or vision changes in the second half of pregnancy is not heartburn; that pattern checks for preeclampsia, so call the same day.