Frequency of sex to conceive

What should the frequency of sex be if you are in your 40's and trying to conceive? Currently my husband and I are at 2-3 times per week. Ive heard so many different things from you should be having sex every 2 to 3 days, to everyday, to multiple times per day! How is THAT even possible for working people?! As long as you have sex around ovulation, is that akk that matters?--does it even matter if you have sex the rest of the time? Im just afraid my husband and I arent doing it enough and need input. As you can probably tell, I am trying for my first......HEEELP!!!