Am I out this month already?

I felt everything was going perfectly this month and then, all of a sudden, right when I was about to ovulate, I got a terrible cystitis. That messed up my temperature, my CM and everything so I don’t even know if and when I ovulated. However, we can’t BD anymore for this cycle. I have to take antibiotics for 7 more days, does it mean that, even if fertilisation happened, implantation never will? Do I have any hope left for this month? I was so hoping for a BFP as our Christmas gift... :(