Ok, my regular cycle is pretty long. On average it is 35 days (long i know). My last cycle lasted 39 days. I got my last period on May 4th, 2011. It is now June 16th, 2011. It has been 43 days and i still have not gotten my period. I am 17 years old and am really worried. I took a pregnancy test and it came out negative. I took it in the morning on the 14th of June. I will take another one in about a week. My boyfriend and I had sex on May 21st. We used protection. However, there were times that we had unprotected sex in the shower. We checked and there was no cum. We did come inside me with the condom on. But we checked the condom and there was no leak or anything. We even squeezed it to the tip and there was no cum dripping out so we're positive the condom didnt break. Could it be stress!!?!? I have finals coming up but i dont feel like it could be stress. idk im so confused. I need help and suggestions?