My period was on July 18. My cycle lasts 28 days. I had unprotected sex with my boyfriend almost everyday till August 1. But I also has unprotected sex with my ex on August 7. Help! Who is the father? I'm pregnant.

There is no way to even guess, of course you had more sex with the one partner, but that does not prove anything. The sex is too close to each other to have any way at all to tell.

Even after ultrasound, that is just a educated guess and is at best give or take a couple of weeks.

So you will have to wait till the child is born and do a DNA test.

Most likely your boyfriend since you were only with the ex once. Honestly it depends when you ovualted since how everyone is different with ovulation but some people can get pregnant even if its not during ovulation. But your chances are way higher with your boyfriend.

My suggestion is if you were faithful you wouldn't have had to worry about this, no face the consequences.

Most likely the father is your boyfriend due to the dates, although a few days can make all the difference, and as Firemanwife61 stated, the more frequent contact that you had with your boyfriend. Although, the statement of being able to become pregnant even not during ovulation is off a bit. You can only become pregnant if there is ovulation. I believe Firemanwife61 may have meant that it is possible for ovulation to be off and for pregnancy to occur at a time that was not expected or that sex a few days before ovulation can result in pregnancy as sperm can survive for several days prior to ovulation. You can't, for example, become pregnant 5 days after ovulation.

However, as Fr_Chuck mentioned, it is too close to know for sure without having DNA testing done. You may not ovulate within the norm.