To whom should I turn after childbirth, my blood pressure is 135/80, w…

To whom should I turn after childbirth, my blood pressure is 135/80, while the norm is 100/70 and I am 23 years old. I have never had high blood pressure before, only during pregnancy and then only in the third trimester closer to delivery and when I gave birth to my first child and then the second, the pressure immediately returned to normal and did not rise. Now it's unclear why and to what doctor should I turn? What could be the cause of this? During pregnancy there were problems with the kidneys but on the last ultrasound showed that everything was okay.