Hi doctor,I frequently got urine Infection after having sex. Although my regular doctor gave me some antibiotic: I took 2 pills day for 5 days, sometimes it’ went away. Then it comes back again.This time my doctor gave me doulble dose: 4 pills a day for 10 days, but I just took 5 days. Then I felt fine so I stopped, now it comes back again.Would you please give me your advice?