Discouraged. Thoughts?

So AF came today. We've been TTC # 2 for 9 months. I did ovulation tests this last time and was positive. My periods are always normal. I don't have endometriosis or any other diseases. I'm starting to wonder if my husbands sperm isn't taking? Does it generally take longer to conceive the second time? I was pregnant 6 months after stopping birth control the first time. Any thoughts or tips would be greatly appreciated. Thanks!