What's happening to my body...?

About a month ago, my period was very late... I had been trying to conceive and I will admit that maybe I made myself believe I had early pregancy symptoms. My breasts were tender, bloated, etc.. Then I got my period in the middle of the night but it was only 3 days of very light bleeding (which is different from my typical cycle). I took a pregnancy test the day before the bleeding started and it came back negative. Now, several weeks later my period is due and I still haven't gotten it. I've started having EXTREMLY FREQUENT urination. It feels like I have to go every 30 minutes or so. I've started urinating in my sleep as well. I'm not quite sure what's going on. if anyone can help... please do.