If my period ended march 23 and i had protect sex but the condom ripped and he came inside and i was fertile . this happened at 6:00 a.m march 29 sunday morning. i went to the doctor monday march 30 the dr. did a pregnancy test and it was negative . i ask

Too soon to test: Did you take plan B, which you should have if you wish to avoid pregnancy. Conception, as defined by the generation of a fertilized ovum, occurs within day or so of the sex. However, it takes about two weeks for the embryo to make enough HCG to produce 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. Use first morning urine and follow instructions for the test carefully.