Recurrent UTIs During Pregnancy

sp

I'm on my second trimester (22 weeks 4 days) This is my third UTI in my pregnancy. I've been drinking enough water, peeing after sex, I shower everyday, I take my antibiotics, I drink cranberry juice, everything you can think of I already tried it. I'm concerned about the baby as I've been taking too many antibiotics. Are there any good natural solutions for UTI during pregnancy? What could be a possible cause?