Stomach soreness??

Hi ladies!!! First time prego over here 🙋🏻‍♀️ I am curious.... I am 4 weeks along, 5’2 and about 95lbs... my stomach has this sore feeling as if I have worked out. Is it my uterus and stomach just stretching? I saw round ligament pain, but it’s not painful.... just a weird feeling. No cramping, spotting jabbing.. occasional little twinge or burn feeling lower abdominal, and then the stomach soreness more middle/higher/ almost all over????? Anything mommas? :)