So I'm going to make this quick on August 16th is when my doctor said that I got pregnant well me and my boyfriend broke up on the 10th and we had sex that day and he came in me. When we broke up about 4 days later I had sex with another guy witch would make it the 14th is there any relative way to tell which guy got me pregnant because I heard from a doctor that sperm can live in your body up to seven days so would that make it really close to being either.

The dates are way too close together. There is no way to even give an educated guess. Doctors judge based on growth, ultrasounds, etc. All of those are guesses and can be off by two weeks either way. A four day difference is impossible to guess.

You'll have to get a DNA test once the baby is born. That's the only way to determine paternity in your situation.

Good luck.