Can you be pregnant if you came on day after of haven sex and only bleeded for 4 days?

It is unlikely that you are pregnant if you started bleeding the day after having sex, as this timing suggests that it is more likely your menstrual period rather than implantation bleeding. Typically, implantation bleeding occurs about 6 to 12 days after conception, which would not align with bleeding the day after intercourse. However, if you have concerns about pregnancy or unusual bleeding, it's best to take a pregnancy test or consult a healthcare professional for personalized advice.