is it too late to BD late at night on ovulation day???

According to Glow today is my ovulation day and I would have to agree based off of my CM and the cramping. My OPK test tell me otherwise but I'm about 99% sure I am. My fiancé and I won't be able to BD untik late tonight once kids are sleeping and he finishes up his work which won't be until 10:30-11 tonight?!.. Do any of you think that's too late as in I might have missed my time frame if I am accurately ovulating???