Ay oo, normal yan sa 30 weeks, marami sa amin nag-experience nito, lalo na towards the end ng second at third trimester kaya hindi ka mag-alala! The swelling usually comes from extra fluid retention at the pressure ng growing baby sa blood vessels, so it's super common. A few of us moms noticed it gets worse towards the evening or pag mainit, so try to rest with feet elevated, drink plenty of water (counterintuitive pero totoo!), at avoid too much salt kung kaya mo pa. But since you're at 30 weeks na, best to mention it to your OB sa next visit lang para i-check nila if it's just normal pregnancy swelling or something else, mas peace of mind lang, hindi emergency. Ingat ka!