Salam! Eh, URI bawah ni memang perlu check dengan doctor tau, especially since you're 31 weeks, jangan delay, ok? Kena pastikan baby okay and make sure it's monitored properly. A few of my mum friends pun pernah kena UTI during pregnancy, memang quite common, tapi the management kena proper under doctor's care je. Go see your gynae soon ya, don't worry lah, doctors handle this all the time. Hang in there!