Gissy,
If you stopped taking the pill and/or didn’t take it regularly and had unprotected sex there is a chance you could be pregnant. It may have been too early to detect the HCG hormone that indicates pregnancy. I would take the test again in a week. If it is negative you could see your doctor to make sure that you are not pregnant (they could do a blood test) and to see if there are other medical reasons for the symptoms you are experiencing.
By the way, even if your boyfriend pulls out there is still sperm in pre-ejaculate and you could still get pregnant. I think that in fairness to your boyfriend you should tell him that you stopped taking the pill. Both partners should be open, aware, and responsible of any consequences of mutual sexual activity. Also, have you told your bf that you suspect you might be pregnant? Have you talked with him about whether he would be there to support you and both of your child if you were to become pregnant? I would talk openly and honestly with him before continuing to have unprotected sex (even pulling out). Good luck and best wishes.
Kate