Why won't my husband have sex?!?! 😓😭

So I'm about 22 weeks and my husband won't have sex with me. He keeps saying it's not me. He works 2 weeks out of town and is home for 6 days. We do it maybe 1 time every 3 weeks. Last night he didn't even finish and just stopped 😢 He said it's hard to be intimate because we can't kiss or anything. Am I ugly??? He is always making me feel so beautiful and is so good to me! I couldn't be happier. The bedroom isn't that great anymore. Not a good feeling from making love constantly to hardly ever! Is my marriage the only one that is going through this? 😓