Stomach hardening over night

Stephanie • My names Stephanie, I`m 25, a wife and mom to two kids, and expecting #3!
Is it normal for your belly to harden over night? I'm 14w5d and since yesterday and today my sides have felt very sore and my stomach heavy. I finally felt my belly tonight and it's very hard/firm and it's not constipation or anything. Is it normal for this to happen basically over night?