Sayang, ini memang serious situation, kencing kotor yang jangkit macam ni kena ambil serius, especially when pregnant. Since you're already in good hands with the doctors and they're monitoring closely, trust the process lah; sometimes antibiotics memang kena tukar kalau kuman tu resistant. Few of my mum friends yang ada UTI serious time pregnant juga kena extend admission, doctors don't take chances sebab boleh affect baby. The isolation and extra precautions they're doing, it's all to protect you and your baby, so yang bagus lah. Minum banyak air, follow all the doctors' instructions, and jangan stress sangat, your job sekarang just rest and recover, okay? Stay strong, mama. This will pass.