If you have short cycles (e.g. 21 days or less) then there is a higher chance of getting pregnant on your period and towards the end of your period than if your cycles are say, 28 days long. You can check your ovulation date on loads of websites - just type in Google - ovulation calculator.
Don't use it as a method of contraception though, because it's not totally reliable! But it might put your mind at rest in this situation you're in right now.
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