What are the chances of using ecstasy once cause any birth defects with my baby?

i took 3 pills when i was 12 weeks i drank a bunch of water almost so much that it flushed everything out and i didn't even feel the pills. (now 14 weeks) i didn't know i was pregnant due to an irregular period and i probably have had like 1-2 beers i had quit smoking (6 cigs a day) about what was week 5 because i had started feeling nauseous now i know its due to the pregnancy. im nervous it could have effected my baby what are the chances of that??? im healthy no medical problems ever and im 19 almost 20.