What is the consequence of taking antibiotic after 13-14 hours that i was supposed to take after 12 hours?

No major issue: should be fine, continue as your doctor has recommended

No worries:: Try to take it on time. While taking antibiotics, as a probiotic, eat 1 cup of yogurt with active cultures twice a day, for 10 days, (which replaces 2 servings of protein for that day). Or eat two servings of Vegan probiotic foods daily for 10 days. See this link: https://www.medicalnewstoday.com/articles/323139.php Don't take over the counter probiotic supplements as they are not regulated by FDA