Intimacy issues

So my SO and I have been together for 4 years and haven't ever had sex problems. But now that I'm pregnant only 10 weeks he doesn't touch me anymore I haven't had sex in 2 weeks I'm going crazy, I try to initiate sex and he shuts me down. Masturbating only goes so far, I want the closeness.

Porn was never an issue but now he always watches it and won't look at me, it hurts my feelings and I'm afraid to express my discomfort. I don't know how to go about it, I don't want to cause an argument.