husband says he wants a baby.. won't ttc on fertile days...

I have never posted anything on here before. I feel a desperate need to vent but don't want to embarrass my husband by talking to anyone we know.. we've been together for 3 years. since the beginning he has told me how much he wants a baby and can't wait to be a father. now that we're married and stable, we have been ttc for 3 months. I downloaded glow right in the beginning of that three months to start tracking right away and know when those fertile windows are.. well first he said it was stupid to have sex when an app tells you and refused to have sex on my most fertile day last month..i got really mad and he said he would follow the app... he has physical health conditions that cause him pain and a lot of the time that's what gets in the way and I understand that. but we agreed on Tuesday, thursday, and Saturday this week. well he already refused for Tuesday saying he was too tired when I got home last night... Ugh I love him and I'm just really frustrated bc he says he wants this but then doesn't even try ..idk just needed to vent. any advice or similar situations would help. thanks :)