can a mild UTI cause intense pain? 😨

Nicole
I'm almost 24 wks and the past three days I've had intense Uti symptoms (urge to urinate, burning urethra) along with pelvic bone aches. I went to the Dr's and there was a trace amount of luekocytes in my urine so he gave he macrobid (antibiotics) as a 'precaution.'
 I took one last night and it did absolutely nothing. I know it's only been one dose, but when I got out of the shower I noticed a lot of white milky fluid (leukorrhea) leaking from my vagina. I'm concerned now that it's not a UTI and some sort of more serious vaginal infection. 
I know luekorrhea is normal during pregnancy, but along with intense bladder burning? I'm worried about having undiagnosed PID...