Normal lang yan, mama! Ako rin sa first pregnancy ko 'yung tummy ko nag-harden minsan, parang Braxton Hicks practice pa lang yan para sa body mo, a few of us moms dito sa grupo namin experienced the same thing around that time. As for the movements, baka quickening pa lang yan, some of us didn't feel proper kicks until 19-20 weeks, especially if first baby mo, kaya just enjoy observing kung saan siya mas active (ang cute ng right side preference mo haha!). But since you're concerned, best to mention it to your OB sa next check-up just to be sure everything's progressing well, okay?