Sex drive during new marriage

My husband and I got married September 2020. We started dating in 2015. Before we said, “I do,” he was crazy about me and had a high libido/ desire for sex with me. Now that we have been married for 5 months, he has completely lost interest. Note that I am 25 years old (and super NeEdY in the area of sex!) and he is 32 years old... so we have a 7 year age gap. He just says he “isn’t in the mood” when I try to initiate anything intimate. He has a doctors appointment for a wellness check at the end of March. He doesn’t seem to think anything is wrong though. 😒

Anyone have experience with this? Or have any advice? please help!