I conceived on march 27 through the 1 of April .with my boyfriend those were my most fertile days and I slept with my ex boyfriend on the 8 of April I found out I am pregnant on the 20 of April I'm really stressed out.. could I b pregnant by my ex boyfriend

When was the first day of your last period? I can give you a rough estimate of when you conceived. However, in the end, you will still have to have a DNA test to determine who the biological father is.

March 18 was my last period but I used a condom with my ex boyfriend

March 18 was my last period but I used a condom with my ex boyfriend

If your LMP was March 18, you most likely conceived on or around April 1.

Again, though, a paternity test WILL need to be done to identify the biological father.