Sir i had protected intercourse on my unsafe days but i don't know whether precum or sperm touched vagina or not after 2 weeks of sex i did a pregnancy test which is negetive but periods been 2 days late. any chance to get pregnant? im very worried?

Probably not if you had protected intercourse but if period does not come on soon would to a pregnancy test to be sure.

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.