You need to talk to one of the medical doctors on the site- I am a Ph.d. Go back into the list and look for a gynecologist You also will need to see a physician because pain requires an actual examination_ and sooner is much better than later!!!
Ok...let me see it I can get this straight. You are 18 and you have been with your BF for 6 months. Now you say that you are on the pill...what I don't understand is, you've been on the pill for 2 weeks and your bleeding everyday or your BF "nutz" in you and....???.
I am having a hard time understanding exactly what you are saying so I am just going to interpret this myself.
If you have only been on birth control for 2 weeks then it is perfectly normal to bleed irregularly because your body needs to get used to the hormones. This would explain the pain as well. As far as being pregnant...did someone talk to you about this stuff because you seem awfully naive?...you CAN become pregnant until the pill has time to build up in your body. Do I think your pregnant? My guess is to say probably not. However, whenever you have a concern about this you should talk to the doc providing the pills or a trusted ADULT.
You seem very young and I believe that you are playing with fire. If you are going to have sex you need to wear a condom and I don't care if you have been with your BF for 6 mths or not...you do not need to become pregnant. And even though you are on the pill there is still a chance that you can become pregnant and let's not forget about STD's. Good Lord girl, you need to take care of YOURSELF. The fact that you are afraid to get a pregnancy test speaks volumes to me...
PLEASE TALK TO YOUR DOCTOR AND WEAR A CONDOM!!