Roller Coaster Morning

I may not have very many physical signs of pregnancy yet, but my hormones are all over the place. Since I woke up this morning I swing between calm, pissed, verge of tears and overwhelmingly anxious in about 30second spurts. Anyone else having a similar experience? I'm exactly 5 weeks today with my second child. I don't remember my emotions being so all over the map until far later on with my first one.