I have not had a period since November. My boobs have grown massively and are always very sore. I am extremely forgetful, always tired, and (tmi) but consitpated all the time now. I have had extremely light cramping in my lower abdomen once or twice. Never around my period time, only lasting half an hour maybe and never any bleeding. However, I've taken two pregnancy tests which have both came out negative. Any advice ?