Another month, another not pregnant

My husband and I have been trying to conceive our 2nd for 8 months now. We’ve been through a miscarriage and a chemical pregnancy. AF is two days late and I couldn’t help but be hopeful this is our month. Just took a test and BFN. I’m so depressed. I don’t know how much longer I can keep this up. We can’t afford fertility treatments. I feel like I’m failing my son by not giving him a sibling.