I might have been exposed a bit to precum on march 14th. i took a urine pregnancy test at the doctors on apr 2 as i had symptoms. came back negative. is this accurate or was it too early to test?

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.