Sore Abdomen?

Randi • In love with my best friend. ❤ 5/26/18 👰🤵 Mama to the perfect baby boy born 11/14/19👶💙

I'm a little over 26 weeks and ever since I woke up this morning my abdomen (can't tell if it's my abs or uterus) is sore whenever I stand up all the way straight or use my abs. It almost feels like I've worked out, which I haven't. Is this normal? I'm not overly worried, just curious. Thanks!