Is it dangerous if i was drinking a lot before i found out i was pregnant?

It depends: It depends how much and how often, but generally the "night of the thre margaritas" before i knew is not an issue.

No: It's not dangerous to you. However persistent alcohol consumption during pregnancy can affect fetal development. The human body is in general very forgiving.

Depends: In early pregnancy, if there is problem there is usually a miscarriage. If you drank until 25 weeks then a possible problem. If you found out early and stopped there should be no effect from the booze. Good luck.