I had sex a couple days after my period ended only once and haven't had sex since that and had no sy...

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I had sex a couple days after my period ended only once and haven't had sex since that and had no symptoms of pregnancy only a day after my period I had a burning sensation in my boobs and a missed period. I went to the doctor asking why it was late and I got told I was pregnant. my period was 3 days late when I went to the doctor