Am I just overreacting?

I'm never late on my period, maybe a day but never more, and I always have terrible terrible camps where I normally have to stay in bed the day before with a heating pad all day. Anyway, I never had my cramps still haven't had my cramps, I'm 5 days late, and no sign of the period starting soon. I took a pregnancy test to see what was going on, and it was a very clear negative, I don't have really pregnancy symptoms, I have been nauseous and some food I want then I look at it and I don't want it anymore and my stomach turns or I start eating everything right in front of me, I've been so exhausted lately, and have been getting emotional over little things I wouldn't typically cry over, but that's about it. No recent changes in life,nothing to cause any stress, or anything,