I recently switched from Beyaz birth control to Tri-Previfem. I have not finished the first week of my new birth control, but i have already been having side effects that I am worried about. I have loose stool (not liquid diarrhea, but very soft stool) at least twice a day but never more than three times a day since i started Tri-Previfem on monday. I am worried that this diarrhea was caused by this birth control and that is also affecting the birth control's effectiveness in working. I had unprotected sex on the third day of taking this birth control. If i have been having regular loose stool, can i be pregnant? Before this birth control, I had taken Beyaz regularly and almost perfectly for about one year.