Menstruation is the body shedding the uterine lining. If an egg is fertilized, i.e. you're pregnant, you won't menstruate.
Just to elaborate on the previous posters answer...
- Although I do agree that it is extremely unlikely, women can-and-do, have "bleed-off" for the first month, and it has happened for even fewer women for the first 2 months during pregnancy... although as far as I know a "typical" period is beyond even "highly unlikely". It is more likely to be spotting or light bleeding for the first month of your pregnancy when you would normally be menstruating. If you are bleeding during pregnancy at ANY time, you should call the doctor immediately.
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