what is going on with me?!

Question

So I been on the pill for about a year now and I have had this app for well over a year and it says today I am late by 3 almost 4 days but I have no PMS symptoms like I normally always do before my period like I feel completely fine besides getting a headache every so often or feeling gassy. My last set of active pills ends today. Should I be worried? I never had this happen before and me and my bf do it often sometimes but we try and be careful but sometimes I am exposed to precum so idk what to do. I am confused I know not to worry tell its officially late and it will be after tomorrow and I have yet to feel any symptoms of it about to start and I usually always at least start having cramps before hand or sore breasts but I have been feeling sick to my stomach and headaches and feeling gassy with headaches the last week or two but headaches and grassiness aren't my normal PMS symptoms

Answer

Update, so I ended up being 6 days late for my period when I noticed I was spotting Tuesday for a hour and then it stopped for the rest of the day tell that night when I got cramping. Anyways I cramped all that night and the next morning but then it stopped and I stopped bleeding Thursday morning and then started again that night and it's now Friday and still lightly flowing but it's not my normal period and it's so light and I normally cramp the first 2-3 days and then it slows down but it's been light this whole time with only one small clump and other then that it hasn't even filled a pad in one day if even half but still slowly flowing when I whip

what is going on with me?!

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