Husband says he’s too tired

My husband and I have been trying to get pregnant for the last 4 months, this month I think has been the hardest. Me and my husband have only had sex for the last 2 days and I started my fertile window on this past Thursday. Today was my most fertile day, I don’t usually mention what days are most important for us to have sex because our sex life is usually pretty active. Tonight I was being all romantic with my husband and doing all the things ( you ladies know what I mean ) and he just says to me that he’s too tired tonight. I’m so frustrated like I said this month because it seems that he’s not into it at all. Any advice? Do you think I still have a decent rate of convincing this month? Tomorrow is my ovulation day according to Glow.