Stress killing sex...

Winter • I am a 31 year old step Mother of four, consisting of two boys and two girls. I've been married for 18 months and been ttc for two months. Praying for a miracle.
I've been horny for two days straight and my husband keep blowing me off so I keep masturbating till I get tired. I don't think he creeping but I do think it's our stressful situation. What if I'm fertile and he's screwing it up for us with this ttc thing. What should i do as far as getting him to screw me?