I had sex in july if i am still scared about being pregnant, test results from now would be accurate, right?

Correct: Yes. Take a home pregnancy test if you are concerned about pregnancy and please see your OB for definitive diagnosis.

Yes: Conception occurs within day or so of the sex. It takes about 3 weeks for the embryo to make enough HCG for a positive pregnancy test. Blood test may be done a day after a missed period. Home pregnancy tests should be done 4-5 days after the missed period. If the result is negative repeat the test in 4-5 days. Use first morning urine and follow instructions for the test carefully.