Need help 30W3D

Genet
I have urinary infaction The third time during this pregnancy a month a go I was treated with antibiotics twice a day for three days unfortunately it's came back again my Dr want me to take cephalexin 500mg three time a day for next coming three days and continue to take once a day till I deliver the baby
I am a little bit nervous since I rad I bout it and it can go through the placenta and there is a chance for risk  that can cause cognitive defect for the baby and Idont want to take any kind risk my question is 
1.Dose any of you who haed expereanc with urinary infaction during pregnancy can advise me haw to treat it with natural way ?
2. Dose any one of you took cephalexin 500mg during pregnancy 
Thank you an advance 
Sorry for my grammar english is not my first language 

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