Ay mama, that's concerning talaga, ants in your urine pero walang glucose is unusual, and since you're 5 months preggy kailangan mo talagang magpa-check sa OB mo agad para sure kung ano ang nangyayari. A few of us moms have had random UTIs or infections na may weird symptoms kaya better safe than sorry, lalo na habang buntis ka pa, might be something simple lang pero kailangan ng proper check-up at urinalysis para ma-rule out.