Need Help from Moms who have had more than 2 babies, please

I'm only 6 weeks pregnant. yesterday my stomach felt like I did a bunch of crunches. it was sore and I could feel it more when I lay down or move around in bed. this is my second pregnancy but I don't remember this with my first.

also below my hips down to my knees feels super sore. I'm not working out or anything just working. but my butt and thighs feel like I've been doing lunges all day.

is any of this normal? did any of you experience this with any of your pregnancies?