Four days period late. . could i be pregnant? i did a pregnancy test yesterday it was negative. .what should i do now is it too early

Pregnancy unlikely: Pregnancy unlikely, but can repeat a test in one week. A urine pregnancy test done correctly gives a reliable result 3 weeks after sex (3 weeks after when conception might have happened) or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and therefore lead to a repeat test.