Hi:-) Considering this was your first time, it is common to have light bleeding. Your most likely NOT pregnant. It doesn't happen that fast.. Besides you guys used a condom. So i think you are fine. If you are going to be having sex, you've already started on the right foot by using condoms but as we all know condoms aren't 100% I would advise you also get on some sort of birth control to be on the safe side
Well if you had sex for the first time, usually you will bleed. You may not see it right away. Some girls get alot, and some don't get much. I only got a bit of brown I think.
It sounds like this was the first time ever? It is common to bleed after the first time a little bit. Very proud you used condom. This truly shows maturity for both of you. If the condom did not break, all is probably ok. The tissue in the vagina is tender and has lots of blood flow, so it doen't take much to bleed a little.