Slipping into depression. Am I alone?

So me and my husband have been trying for 20 months for our first. Just started my first cycle of a trigger shot and it didn't take. I have only one ovary and PCOS. My husband says I put too much pressure on myself. But how can I not when it's MY body that's the problem. He's been tested and he's good to go so the problem is all me. I go through my day, pretending to be a functioning member of society, and when I get home and I'm alone, I just want to curl up into a ball and cry. I've been able to keep my depression at bay for 16 years by trying to maintain a positive outlook but lately it's gotten more difficult. I try to be this bad ass that's tough and never cries but it's gotten to the point to where I'm struggling to keep it together. I feel myself slipping back into depression and I don't know how to stop it. Am I alone?