Not sure what to do

This is my ovulation week and my husband doesn't really seem to be intrested in sex. We had it once 2 days before my ovulation period started. I've tried different things and he doesn't seem to stay hard. This has started happening more over the last several months. I feel like it's me cuz he never used to be this way. He says it's not but in my mind it is when I can't even get him interested in having sex unless it's been a week or more. We don't have s boring sex life we try new things a lot. We even use toys sometimes. I'm not sure what to do I just know this is really bothering me.