Need advice!

Husband and I have been TTC for almost a year. He has never had issues with getting an erection or ejaculating. I ovulated today so it was really important that we have sex last night or tonight. He couldn’t get an erection either time. I’ve tried to play it cool so that he wouldn’t notice how upset I am. He is really upset too. Does anyone have any advice on what I could do to help him? Are there any over the counter medications that could help? I guess we’re out this month, but I want to be prepared if this happens again!