Why doesn't he want sex anymore?

So I'm almost 9 weeks pregnant, & lately I been really horny for my SO a lot lately, and everytime were cuddling in bed ill reach down to touch his dick or try kissing him & lately he's been saying no & rejecting me? Which I find is very odd, but I honestly can't help it, he's just so damn sexy and i notice myself more attracted to him then ever, an yesterday I even sent him a sexy vid on snapchat while he was at work and he payed no attention to it, earlier this week I even sent him booty pics an he didn't care either :/ usually all guys jump when a girl wants sex, 😒😕I'm just starting to feel like he doesn't want me anymore, or isn't attracted to me cause I'm pregnant, it's really starting to get to me, and idk what to do, does anyone else's SO do this?