Hey mama, yan ay pretty normal sa pregnancy especially when you're standing, ang ligaments natin nag-stretch at ang Braxton Hicks contractions pwede nang mag-start kahit early pa lang, kaya feeling mo hardening ng tummy! But since 11 weeks ka pa lang at gusto mo maging sure, definitely check with your OB para ma-rule out kung may concern, lalo na kung may pain or bleeding kasama niya, okay? A few of my mum friends had the same thing at ang doctors nila na-assure sila na normal lang.