My periods have almost always been regular until just these past few months. In June I didn't get one at all. Then in July one in the first few days and one in the last few days. I missed it again this past month and just clued in that just this past Saturday I noticed almost like a light brown discharge (looked like old blood) and I figured it was my period starting. So I put a tampon in and by the time I got home(large sum of hours later) it was almost dry. Figured I'd put another one in over night just in case, but nothing since then. I am super tired ( but also have been staying up late) moody, either super hungry or not at all. Amung other things. My breasts have also grown a full cup size in the last 6 months. And they are slightly tender at this moment. Also get slight cramps towards the end of the night or early morning. Doc sent me for ultrasound and bloodwork in July but everyrhing came back neg. I have no idea what is going on and I need advice before I go to my family doctor as he is hard to get into.