Infertility?

Brittany
I'm 25 and my husband is 48. I had a daughter when I was 20 years old and then shortly after got a Mirena put in. During having the IUD in I didn't get a period. I got the IUD out in April and we have been trying ever since. I'm super discouraged getting my period every month, especially when my mother in law thinks my husband is infertile because he has never had a kid in his 48 years. Any ideas? Advice?!