I just don’t understand...

I’ve gained a bit of weight since we’ve been together between bc and just life. Now we’ve been together for two years, and I don’t think he thinks I’m very attractive anymore. Like, we’ve both changed a bit, we’re not super active teens anymore. But I thought we’d both kind of accept that? You don’t stay thin and young and beautiful forever right? Now we’re ttc and I keep having nightmares that he’ll leave or no longer touch me after my body has gone through carrying a child and labor. Maybe it’s irrational, but sex has tapered down since his new job and we’re both really busy. I have no doubt that he wants a family together as much as I do, but I’m afraid he’ll neglect me entirely. We only have sex a couple times a month, when it used to be a few times a week. Maybe I’m over reacting but I’m frustrated. I just want my body to be loved and sexy, but I don’t think he feels the same. He denies my advances because he’s too tired or too busy, and it hurts. I asked him tonight if he still thought I was pretty, but he was watching tv and didn’t respond so I left it. I still get some attention, but it’s not at all like it used to be. Maybe I’m just over reacting :(