Super sore abdominal muscles ?

Almost 10 weeks pregnant and I have been experiencing very sore muscles especially in my stomach but it’s even tender to touch. I’ve had it for about a week or two now and I’m not sure what’s causing it, this is my second pregnancy I have a 10 month old. And this pregnancy has been way harder than my first I feel very nauseous. Every day I’ve been taking B6 and Unisom I have a headache constantly even with magnesium and Tylenol, multiple times a day, and my overall fill my body has been awful. Has anyone else experienced the sore stomach muscle before?  I’m feeling so awful each day. It’s hard for me to even get down and play with my little girl.