Shorter period?

My period came four days later than usual and only lasted three days. Its usually 5/6. I’m aware of the differences between implantation bleeding vs a period and period blood. However this was just standard period blood ( bright red) but its finished a few days early. Anyone else? Could I be pregnant? I have had... show more My period came four days later than usual and only lasted three days. Its usually 5/6. I’m aware of the differences between implantation bleeding vs a period and period blood. However this was just standard period blood ( bright red) but its finished a few days early. Anyone else? Could I be pregnant? I have had unprotected sex. Thanks.
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