Re: 3 days
If you have had sex-especially unprotected then yes it is possible. I have had a few of my friends not know they were pregnant for 3 or 4 months because they still got their period. They said it was either lighter than regular or shorter than normal, but since it was there, they didn't worry. The only way to know I guess is to take a hpt-make sure you use first morning urine.