Condoms??

Okay so I have been under a lot of stress lately, so my period was late, I knew I wasn’t pregnant because I didn’t have any symptoms of a period or anything. I knew it was just because of stress. Well he was worried because we don’t use conforms and it’s just the pullout method. I was two days late...anyway now he is insisting that we will use condoms from now on. And I’m okay with that but only during my fertile window. Its extremely hard to get pregnant any other time other then during that Ovulation time but he won’t compromise. What do I do?