What birth control are you on? Unless you’re on the non hormonal copper IUD, you no longer have real natural periods and therefore you are not “due”, “late” or “missing” a bleed. Any bleeding is a side effect of the pill and doesn’t really mean anything. The ‘cycles’ you experienced is just irregular bleeding, a side effect of the pill.
What antibiotics were you on? The majority of antibiotics do not affect the pill unless they give you severe diarrhoea or vomiting that affects your BC. The only ones that do treat serious illnesses like meningitis and TB, in which case your BC will be ineffective for a month after use I believe.