Conception is when the sperm fertilizes the egg. This generally happens inside the Fallopian tubes within a few days of intercourse. You can't feel this cellular event.
while you may not feel conception itself many women report flu like symptoms days after conception...then when they miss their periods they put two and two together and realize it was Morning Sickness after conception
Sometimes you will have very light implantation bleeding when the egg attaches to the uterine lining.
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