Haih sayang, kalau dah on antibiotic then okay tapi sakit balik lepas habis ubat, boleh jadi infection tak fully cleared or maybe kena reinfect je, kena follow up dengan doctor pulak to confirm la, terutama dengan kebas kebas kat peha tu sebab that's not typical UTI symptoms ja. A few of my mum friends ada sama, and most turned out kena extend antibiotics or switch to different one, so jangan self-diagnose sangat ye Drink plenty of water in the meantime and keep the area clean, tapi definitely book an appointment dengan OB/GYN tu untuk check proper, tak payah tunggu lama-lama, better safe at 17 weeks kan.