I'm not sure I'm clear on this, but are you saying you went out drinking and you are worried about the effects on the fetus? It is very likely if you just got a + test, but had a negative one just 2-3 weeks ago, that the embryo hadn't even implanted yet when you went and had some drinks. It should be fine, many women drink before they realize they are pregnant. If you do plan to have the baby, you should of course stop drinking. I don't know enough about self-induced miscairrage to give you advice about it.