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This can be a difficult question to answer as your body will sometimes change. It is common for hormones to change in your body thus affecting your menstral cycle. Based on what you shared with me, if your boyfriend had a condom on and he did not ejaculate, the chances of getting pregnant from that encoutner are nearly impossible. The only way to determine if you are pregnant or not is to take a pregnancy test. Below I have place a link where you can access clinics to perform pregnancy and STI testing.
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