Menstrual cycle causes cramping, breast soreness, enlargement, but not pregnant?

Hi, my name is (…) and I am 24 years old. I currently take Microgesterone but that is the only medicine that I am taking regularly. I am nervous and unsure about whether I should be. I have been cramping and have been experiencing breast soreness and enlargement which I have not ever experienced the latter even during regular menstrual cycles. I did take a home pregnancy test which showed as “not positive.” Since I have been on birth control, I have had some irregularities with my cycle, but this just seems different with the added symptom that I haven’t experienced before. Could you help me with this?