hi there it depens on how long your cycle is?? how long after your last periiod was the sex? if its a normal 28 day then you would have ovulated maybe 4 to6 days later. when you ovulate you usually get your period 14 to 16 days later.. there is a small chance you could have gotten pregnant. best thing to do is wait till maybe next monday or tuesday to take an early response test with your first morning urine.
hope that helps a little
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