No sex drive..?

Ok, so what is wrong with me? Lately I have had no sex drive at all! My husband wants sex and when he mentions it I get turned off and I just don't feel like it. I haven't for weeks now and I don't understand. I want to have sex with my husband, but have no drive to actually do it. Has anyone else felt this? Do you know why you felt this way? I'm just so confused! 😒