Absent period negative test

My boyfriend and I have been trying for a baby. I had a period in January (5th-9th) it was pretty normal but what was not normal is that I had another 2 weeks right after (23rd-27th). That was the weirdest thing. It was 3 days spotting and then a flow on the 4th day and the 5th day I was cramping more than bleeding. In February I didn't have a period at all. I decided to test on the 2nd of March. It was negative. But I still have yet to see a period. I'm having soreness on the side of my boobs and I've been cramping. I've also been going to the bathroom a lot and very moody. Has anyone else gone through this? I'm 22 years old and I've never had this before.