On monday my period was just came for 1 day and it wasn't heavy like other months and spotting for 1 day after that.i've been having a terrible headache,fever and tiredness.i did a home pregnancy test and it came out negative?

Pregnancy Test: Pregnancy tests are accurate 7 days after your missed period. You did not say when you took the test, so please repeat if necessary.

See below: 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.