Please explain the time taken by a fertilized egg to implant.

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It depends on your period length and regularity that when and how the system will work. If you have regular periods then 14 days before menses you have ovulation, and if fertilization occurs on the ninth day, then you can have implantation at right or wrong place. If one-sided lower abdominal pain occurs after unprotected sex at the end of third or fourth weeks post period with or without bleeding, then it should be reported that you need urgent beta hCG. If positive, then should repeat beta hCG after 48 hours to check its progression to finalize the diagnosis if the pain is not severe. If after a positive pregnancy test for the pain have a transvaginal scan by expertise hands, immediate intervention. Have complete treatment of any health issue you have. Practice daily walk, yoga, and exercise. Have recreational activities and quit recreational drugs. You need to consult for detailed evaluation.