Sore stomach?

Sarah • First time mom, expecting Audreigh Anne July 6th 🎀👶🏼✨
Does anyone know why or has anyone else ever had a super sore stomach? Like I feel like I just did like 100 crunches, I'm 20 weeks and my baby girl kicks but it's not hard enough to even feel outside yet, it's been like this for a few days, anyone know why?