Crazy or cranky

I feel awful posting this I should be ecstatic and not letting anything bother me I'm happy I'm pregnant dont get me wrong but I'm 12 +1 weeks and I've got such a short fuse I really feel for my other kids I'm so snappy and I feel like I just want to cry is anyone else having this I'm not sure If it's down to the nausea I've been having I was really hoping it would disappear by now or whether Its just because im so exhausted all the time or hormones please tell me im not alone