I've had two negative pregnancy test but yet i've missed my period for two weeks & i have most pregnancy symptoms second baby?

Tested too early? : Please repeat the home pregnancy test. You may have tested too soon.

Time and technique: 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.