If hcg negative in urine can i find it in blood?

Possibly: The urine test has a threshold of 25 miu/cc of hcg. The serum test is quantitative, .

Possible: 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.