Was in the er

He did a urine analysis he calls me a said I have a mild infection and if I still have the pain to take the meds if not i don’t have to I don’t understand why he’s say that .. I’ve just been having on and of cramping and lower back pain It doesn’t burn to pee but I see me using the restroom not constantly but just not being able to hold in my pee as long .. plus I’ve been very bloated

He gave me macrobid has anyone ever taken this ? Can we do probiotics will taking this to help