Baby Fever

I have been nonstop baby this and baby that. This is the strongest baby fever ever and it won't go away. I keep looking at maternity photos, my friends baby bumps, baby clothes and when I used to be pregnant. What does this mean? I haven't had my period yet and I've already taken 2 pregnancy tests but they were negative. What's wrong with me? Am I pregnant? These past few weeks I've been super cranky, moody and irritated easily. I'm on a short fuse and I've been super sensitive and emotional. Help!