Can I Get Pregnant Inspite Of No Ejaculation?

Sir, I m 21 years old Is the result of preganews pregnancy test kit 100% reliable and correct after 21 days of unsafe sex. Earlier also,in september, suffered a problem,my period did not occurred for about two and a half months,in december,i went to see a doctor and was advised to take sonography,i have the sonography report, but due to lack of money, but due to lack of money,i could not visit the doctor to show the result That time i hadn t had sex. Then, my period occurred naturally without any medication, and then next two months i had regular periods Now my period is late about a week,i had sex but my partner used pre ejaculation technique. I had the pregnancy test,it resulted negative Am i pregnant? i don t want to get pregnant, what should i do