Ay, understandable ang worry mo, lalo na 18 weeks ka na! Honestly, UTIs can definitely cause perineal pain kasi inflamed lahat ng area, pero since may ongoing UTI ka, best talaga na i-follow up mo yan agad sa OB mo para malaman kung ano exactly ang nangyayari, baka kailangan lang ng mas strong antibiotics o something else na dapat i-address. A few of us had similar experiences and sabi ng doctors namin, mas maayos once na na-treat properly ang UTI, so huwag mag-self-treat lang, get it checked out rin!