Can you girls help me please :)

If you have sex the night before ovulation is there still a chance of conceiving? 
Me and my partner are both poorly, he has a really bad back and I have a bad ear, so we didn't do the deed today, my ovulation(most fertile day) now I'm thinking I'm completely out this month, that AF will show her stupid bloody face in 2 weeks time. 
It probably is a silly question to ask, but would just like to hear your girls answers. 
Thank you