Hi! I am 18 years old and have been taking Tri-Sprintec birth control for 5 months. I have never missed a pill, I have taken 2 pregnancy tests (both with negative results), and have not missed a period. However, I have extremely sore breasts almost all month, and some stomach cramping/bloating. I have pretty much ruled out pregnancy due to the facts listed earlier. I also have PCOS. Are these symptoms possibly caused by the birth control or the PCOS?