Good evening. Have any girls experienced hard lumps in their breasts d…

Good evening. Have any girls experienced hard lumps in their breasts during pregnancy that are unpleasant to touch? Today I have developed a lump on one breast and from one side, tomorrow I will go to the doctor, but suddenly anyone has had this and can it be like the breast restructures and prepares for lactation? And then I work in oncology, so bad thoughts immediately creep into my head ?