Getting on my nerves!!

Ever since Ive been pregnant (9 weeks along now) i immediately noticed my mood change. I have two boys and never experienced this being pregnant with them but everything easily gets to me now. The slightest thing sets me off, i have attitudes with people i never had before, I hardly recognize myself! I lose patience fast, when before I was so patient and slow paced with my boys and hubby, but now the tiniest misbehavior or comment makes me blow up. I was never this way and definitely notice it. I make a mental effort to recognize it but its so strange!!! Who is this person!? Anyone feeling similarly??