Pregnancy and lack of sex

Since I got pregnant I have no urge of having sex. I am a very sexual person and my SO is great in bed. I just cannot even stand him touching me or kissing me. Is this normal? I don't even get turned on by anything, not even a hot guy on TV (for example). What the hell is going on? I am constantly cranky and sex is not even the last thing on my mind. I am so down and don't know what to do. Any advice? Thank you