 [ Symptoms ] how can i handle frequent urination during pregnancy [ Disease ] during the first trimester your growing uterus and growing baby press against your bladder causing a frequent need to urinate this will happen again in the third trimester when the baby is head drops into the pelvis before birth recommendations avoid tight fitting underwear pants or pantyhose contact your health care provider if your urine burns or stings this can be a sign of a urinary tract infection and should be treated right away