I'm Becoming Depressed

I can't stop thinking about TTC. Baby #1 took over a year and we've been TTC baby #2. A friend of mine just announced she is PG and she hasn't been trying really. I have irregular periods and if I don't conceive with this ovulation, my next ovulation won't be until June. I'm 4dpo and I just feel in my gut that it's not going to happen. I'm just becoming so depressed. My husband is so excited and wants this, too. But for a couple weeks now he's been having trouble with keeping an erection and ejaculating. He wants this. But I think he's just become so stressed that it will happen (him not being able to keep an erection) and he gets it in his head so bad that it actually does happen. I know not to stress and God will let it happen when the time is right, but it's still so hard not to get down about it. Sorry for the rant, just sad.