Don't be so afraid of it son, there is not any possibility to get pregnant thorough anal sex and fingering. don’t worry... Sometimes periods are too late... So the best would be to see a few days and then immediately find a doctor. Read here:
https://lovematters.in/hi/resource/menstrual-cycle
https://lovematters.in/hi/our-bodies/my-periods-are-irregular-what-should-i-do
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Don't be so afraid of it son…