ovulating on a cheat day

I never thought about that. I've definitely taken antihistamines within a few hours of having a drink and didn't notice any bad effects....

That's exactly what I would have told you to do - enjoy and then TTC because it's the overall pattern of diet that counts and not any one meal or day.

It's ok to take antihistamine and alcohol on the same day but just be sure it's been a good 6 hours after!!