Feeling sad.. 😔

I am currently pregnant with my first baby. Before pregnancy me and my boyfriend had a very active sex life. It has completely changed. Before we would have seen about 3 times a day but now it feels like it hasn't happened in weeks. He says we've been doing it so much we can relax for now but I don't think he understands how unattractive and fat I feel. I'm already struggling with my emotions and this is making me feel so much worse. I believe sex is a big part of a relationship and I'm starting to feel distant from him and I want to feel back to normal. I hate feeling this way but now I feel like he's just not attracted to me any more. I know this all sounds a bit stupid but I can't help but feel this way especially when I bring it up to him and he just brushes it off 😔