If you are at all doubtful, don't do it. You've got plenty of time to think about it and plan things.
As much as it is your choice, I wouldn't do it just to do it. If you aren't in a relationship that is safe, loving and trusting, there are many more consequences that can come with sexual intercourse for the wrong reasons. You do not know if this boy has any STD/STI's, which can do a lot of damage since many don't show signs immediately. You don't know if he knows how to use a condom correctly, and even if you use it right condoms can fail for one reason or another (using one correctly means also using extra lubricant, and not pulling out before ejaculation), not to even get into the emotional side of intercourse, and how doing at the wrong time for the wrong reasons can do a lot of damage emotionally.
Really, we don't know this guy. Some guys who sleep around want nothing to do with the girl afterwards, and if this is the case, you've been used. Why would you want to put yourself in a situation like that, where if you do end up with an accidental pregnancy, you have no support from the father?
[This message has been edited by JamsessionVT (edited 09-22-2005).]