What could blood in urine but no bacteria indicate during pregnancy?

I am 28 weeks pregnant and developed abdominal and lower back cramping a few days ago. I had not experienced this before so I called my doctor and was advised to go to labor and delivery. They tested my urine and it showed blood so they did an in and out catheter. The lab results showed blood but no bacteria in the urine. They just sent me home and told me to drink lots of water. Any ideas what this could indicate?

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