I'm pregnant and a friend cooked me a meal and used beer to cook the meat. i didn't know and ate it. is this bad for the baby?

No: The amount of actual alcohol you actually consumed is likely to very low and poses very little risk tour fetus.

Cooking w/alcohol: In most cases, cooking w/alcohol burns off said alcohol, leaving behind only essence & flavors of the beer/wine/liquor. In other words, assuming that one heats the meat during the cooking process, any alcohol will have been burned off prior to eating it. Of course, if you drank a beer while eating the meat, that's another matter altogether.