Update just in case somebody ever experiences the same.
Went to GP and had my bloodwork done. It was fine. Prolactin dropped from pre-T levels 513 to 300 (6 months on T). It obviously wasn´t the prolactin.
I was taking dydrogesterone (progesterone pills) for PMS but apparently this is a (extremely rare) side effect that you can have. Be aware of this if you take any type of progesterone or are considering it. I´m quitting them myself.
Also, if you do have a prolactin level that is way high (over 500), the GP will refer you to an endocrinologist, who then will check that you don´t have PCOS, prolactinoma, or problems with the hypophyse, or slow thyroid function.