(I'm a little bit confused per the first bit, given this post -- http://www.scarleteen.com/forum/Forum27/HTML/011012.html -- but that's largely academic.)
Thre weeks is pretty quick to get sexually involved per what works for a lot of teenagers. Chances are, your friends hearts are in the right place, even if they're being bossy about it.
Have the two of you had the time to really talk about the emotional and physical risks of sex? To negotiate and utilize safer sex practices? To talk about how you'd handle a bad consequence? To foster some decent communication?
If you HAVE been able to really do all of that, and you both feel okay with everything else, then perhaps you need to tell your pals that for you, right now, this is right, but that you appreciate their concern.
If you have NOT, then maybe it's worth at least some pause to hear what they have to say, and evaluate things accordingly.