Thanks for writing your query.
After reading your post, I would suggest that you should lead a healthy lifestyle and should follow some precautions, to prevent symptoms of acidity, like :-
1. Avoid spicy/oily foods.
2. Donot miss a meal.
3. Avoid emotional or mental stress
4. Drink atleast 8-10 glasses of water daily.
5. Avoid self medication
especially with pain killers.
Taking yoghurt or curd will help you both in controlling acidity and also help in lactose intolerance
Since you are pregnant, you should avoid taking any medicines- even multivitamins, without discussing with your gynaecologist.
I hope this is helpful to you.