Acidity in pregnancy is next level, but please don't play doctor with over-the-counter meds! I only took antacids that my gynac specifically prescribed. Give your doc a quick call, they will tell you exactly what is safe for your tummy.
Please don't take any medicine like Rantac without asking your doctor first, even if it's just for acidity. When I stayed at my parents' place, my mom used to give me cold milk or fennel seeds (saunf) which helped a lot. Keep it safe for the baby.
Ugh, pregnancy heartburn made me feel like a fire-breathing dragon! But seriously, do not swallow any pill unless your gynac gave you the green light. Just send your doctor a WhatsApp message, they'll prescribe the right safe syrup or tab.
I am also dealing with horrible acidity right now but I'm too scared to take any medicine on my own. Did your gynac actually suggest Rantac MPS to you? I am planning to ask my doctor in my next appointment before taking anything.
Since we are trying to conceive, I have become very careful about taking any tablets. It's always better to avoid self-medicating and ask a proper doctor first. Hope your acidity gets better soon with some simple home remedies.