hormones dude /:

So I have been dating my boyfriend for 3 months. I'm 29 weeks pregnant. so he hasn't known me when I'm not pregnant.. He's taking on the baby like it's his own and he's an amazing man. now that I am in my 3rd trimester my hormones are making me depressed and quiet. He keeps saying I've changed and I'm not happy and silly like I was when he met me. I feel so bad that I'm like this buy legitamately feel like I have no control over it. I also have no sex drive at all and sometimes he mentions that too but not in a bad way. I need help, what do I do? I feel like once again my depression is ruining something and my hormones are crazyyyy.