I also say that it is most likely your period. But I also agree that now that you have chosen to be sexually active you need to responsible. Pregnancy would be the least of your worries. With all the stds out there these days, you need to talk to your doctor. The only person you are positive that has never had sex prior is yourself. Even if you think the guy you are with say he has never been with someone else, it is your body and you life, it is not worth the gamble.
THen it's probably your period. Bleeding after intercourse (ecspecially the first time) is very common, us woman have a hymen and that gets broken which is what causes the bleeding. But you shouldn't be bleeding for 3 days.
If you are at all concerned please go to your doctor - you have made the choice to have sex and now you have to be responsible for your body when things aren't the way you think they should be.
You can get pregnant any time, first time, 50th time, no matter what position you're in etc. Go and see your doc if you are at all concerned. Often it takes them 5 mins to ease any worry.
actually its my time in the month. its just that its early because i usually have my period every first or last week of the month..and i had been bleeding while having sex..what do you think is the that?
Both some bleeding and some pain are normal the first time a woman has intercourse. If it is not your time of the month to menstruate, then it is probably not your period. If that's the case, go to a clinic and see your doctor to make sure everything is okay.
Pregnancy does not happen immediately - it takes a few days (someone correct me if I'm wrong). You can get pregnant anytime you have unprotected sex (including the first time).
That said, if you're going to have sex then BE responsible. Don't wait until after you are scared that you're pregnant to think about it. Buy some condoms (cheap, discrete, easy to use). Consider going on the pill. Look at other methods. Type "birth control" into wikipedia and see what comes up. Talk to your doctor.