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Beta HCG, the hormone that is detected by pregnancy tests, plays a role in increasing blood flow to the kidneys. Hormones such as progesterone and relaxin are also involved in enhancing filtration by the kidneys,

said Ashley Parr, an obstetrician and gynecologist at MemorialCare Saddleback Medical Center in California, as quoted by Parents.com.

“Starting around 10 to 12 weeks, the uterus has grown to put pressure on the bladder. This limits the bladder's capacity to hold urine, which also causes frequent urination,” said Ankita Langan, MD, an obstetrician and gynecologist at Novant Health in North Carolina.

"Under certain conditions, these symptoms can sometimes be a sign of something more serious. 'Frequent urination should be noted as it can be a sign of an underlying medical condition such as a urinary tract infection or even an asymptomatic bladder infection. This condition can cause a normal pregnancy to be at higher risk and must be addressed immediately,' said Kyle Graham, MD, obstetrician and gynecologist."

"When a pregnant mother feels that the frequency of urination is very disturbing and is accompanied by symptoms of fever and pain, she should consult a doctor immediately. There is no need to delay or feel embarrassed. Tests or laboratory examinations are needed to determine the underlying cause in order to receive the appropriate and effective treatment. So, it's not always normal, moms. Source: Parents"