Don't know what to do??

Hi everyone,
Just looking abit of advice. I have been off my pill now for 4/5 months. Though the app has told me I was due my period on Saturday (my periods have been on time every other month). Though I STILL haven't took it as I think in my own mind my period isn't due until today (STILL not here yet).
I've been very nausea from Friday and today has been my worst day with it, my breast are sore tonight and last night my stomach was getting small stretching pains (if that makes any sense). I don't want to put anything into my head yet. Though I'm looking abit of advice, what way would you take it if it was you?? And when is the latest you would take a test??
Thanks 😃

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