Urinary Tract Infection

Some of the hormones of pregnancy, making the muscles controlling the flow of urine you more slack, and not quickly contracting as usual. 

This condition makes you more at risk of urinary tract infections (cystitis). If left untreated, the infection can spread to the kidneys and stimulate contractions that are not supposed to happen.

Safe drugs: Antibiotics prescribed by a doctor.
Unsafe Drugs: vaginal cleaning wipes, because high salinity (alkali), that "invited" microorganisms to flourish
Alternative Therapy: Drink a lot, especially water, to help "throw" the bacteria causing the infection.