Ay oo, normal na yan sa 30 weeks, mama! A few of us sa barkada namin experienced that din, ang swelling usually worse towards the evening or after standing the whole day, lalo na sa feet at hands. Best thing is mag-elevate ng legs mo when you rest, stay hydrated, at avoid standing too long; one of my mum friends swore na tumutulong din mag-wear ng comfortable shoes or maternity compression socks. But since you're asking, better check with your OB din just to rule out anything else, especially if sobrang laki na ng pag-swell or may kasama pang headache or vision changes, okay?