As long as it is a tiny bit, and there is no pain involved, you should be fine. In time, it will likely stop.
What type of birth control are you two using? I would suggest that both of you are protected, such as you being on the pill, or some other form of female birth control and he using a condom every time.
Us women must take the responsibility to protect ourselves from all the possibilities that come from sex...from the wide range of std's out there today, to pregnancy.
Make sure you can freely discuss all this with your boyfriend, and that he is on board with whatever choices you make. Once you begin to have a sexual relationship, you begin a life time of responsibility for yourself and your sexual organs.
This is also the time in which you should begin your gynecological exams, which you can hopefully communicate with your mother about.
I know I have gone way farther than simply answering your question, but this is the time in which all these things need to be discussed. It is a big step that I encourage to take very seriously. My best to you, and feel free to come back an ask any other questions you might have. We are here to help, and support you in this special time of your life...
Last edited by Mod-S4; 04-08-2011 at 04:48 PM.