Thank you for writing.
The more sites you read (and the more stories you read from other readers/posters) the more answers you will get. We just stick to the science.
Pre-ejaculate itself does not contain any sperm. Sperm may be inside the urethra if a man ejaculated recently and did not urinate since. If he urinated since he last ejaculated, there is no sperm at all.
Since you had unprotected sex without ejaculation, pregnancy is highly unlikely. But there is always a very small risk if you were ovulating, as a woman cannot be 100% sure there wasn't any kind of regular ejaculation. But your risk is tiny and there is no risk if you were not near your ovulation time.
Your next period will be evidence there is no pregnancy. Always use a condom in future to avoid even the smallest risk.