not feeling the attention I once did

My husband and I have been married 9 years , together for 15, and I’ve always felt like the best thing of his life. I mean he always told me and treated me like the most beautiful woman he’s ever seen. We have one daughter , trying to have a 2nd. But here lately I just feel like he’s not attracted to me anymore. I feel lie I have to ask for sex , and when I tell him my fertile window he gets annoyed like it’s a job for him. I don’t want to make him feel pressured but I also feel like he’s not trying with me . I dont know if he isn’t feeling it anymore or if he’s stressed or what . Is anyone else going through this ?