Recently, my boyfriend began injecting cocaine. I've noticed that he and his friends share their needles, but "clean" them first with bleach and water. Is this a valid way to avoid contamination?

My friend recently smoked some pot laced with cocaine. First of all, is this possible? Whatever the case may be, he seems to be infatuated with the idea of trying straight coke. I've heard that trying coke for the first time is quite dangerous, true? Also, what are the effects of the high? And how detrimental is coke in general?

I was really drunk and don't remember the night clearly, but I think I may have had sex. Now I don't know if I could be pregnant or not. I had never had sex before this. Help me please!