Increased frequency of urine could be because of increased blood volume during pregnancy and also because of the pressure of the increasing size of the uterus on the urinary bladder. Breast pain is because of the increasing pregnancy hormones and also because of the beginning of milk production in the breast.
Warning signs -
Pain in the lower abdomen
Vaginal bleeding
A severe headache and vomiting and increased pain during urination along with fever and shivering.
In such conditions please contact your Doctor immediately.