Quitting smoking

My SO is quitting, today he went 6 hours without one at work then came home and was nothing but rude and very short with me then he stormed his way up to bed.. 
I'm not sure what to do.. I want to be supportive but at the same time I just found out I'm pregnant and I'm emotional and I need support too.. But I can't say anything without being wrong or stupid or pissing him off. Like what the fuck. 
Super stressed out right now 

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