I have a trapped gas in my digestive system

What do I do? It hurts so bad!
Like it's in my lower belly and than I feel the gas in my throat and I end burping but just now when I burped some acid of the drink I had came up alittle. 
Is this normal!? I'm only 18 weeks pregnant. I haven't been able to use the bathroom as well in like 2 days or so.
I hate the pain of the gas, it's literally like a gas in my chest. 

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors