Had sex during ovulation using the withdra method as birth control. after that my period came four days early and lasted for only two days. pregnant?

Probably not.: Do a pregnancy test to make sure that you are not pregnant since you had unprotected sex during ovulation.

Hard to speculate: The withdrawal method is not effective birth control, just makes it less likely. The erect penis secretes sperm containing semen continuously during sex & it only takes one. A normal period suggests no pregnancy but implantation bleeding from a pregnancy may seem similar. Doing a series of urine pregnancy tests weekly can sort it out. It can be negative early in a pregnancy.