I feel cramps im 28 weeks

Hi, Im 28 weeks i feel something painful in my tummy down like that feeling when u meet someone u really love like pain or excitement thats how i feel idk what to do i feel in my left side of tumy n right i feel my stomack upset what is this n how contraction suppose to feel like, or the braxton kicks ?! Please help what should i do its not painful but it's uncomfortable