I haven't had my period since july 28, lasted till august 2nd not normal for me i took a pregnancy test this month and it was neg could i be pregnant?

Yes, but.....: Many things can cause a delay in your menstrual period like stress, new diet, new medications.....Give it a little while longer, and it it still hasn't "arrived, " see your doctor.

Could be: If you had sex since your last period and missed your period by 4-5 days, do a home pregnancy test. If the result is negative repeat the test in 4-5 days. Use first morning urine and follow instructions for the test carefully.