Week 18 stomach pain

I'm currently in 18 weeks and today I experienced tummy discomfort. The pain is 1/10 but i feel weird in the tummy. Oh, i had a cup of jasmine green tea and chicken briyani for lunch today. Idk is it indigestion or is it something that i have to be aware now.. or is it uterus expanding or what? Desperately need advice!! #pleasehelp #FTM #firstpreganancy