Three negative pregnancy tests after 18 days makes pregnancy unlikely. That said, condoms are not 100% effective, and neither are home pregnancy tests. If you don't get your period soon, you will have to keep testing, or see your doctor for a more precise test.
Answered 12/16/2021
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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.
Answered 12/17/2021
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