I could just cry

Every single month without fail we miss ovulation window because my parter can’t keep an erection. We barely have sex. Once a week. I give him oral and his dick just goes limp in my mouth. Or he will be hard enough and then when we switch from oral to sex he goes limp during the position switch. I’m so frustrated idk what to do! He won’t try Ed meds. TTC is taking soooo long because we can’t get any fucking sperm in my fucking vagina.