I dont use contraception. last period was on feb 16. had unprotected intercourse (pull out method) on feb 27. observed just 3 to 4 drops of spotting on march 5. what does the spotting mean? is there something that i should worry about?

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.