My pharmacy has switched me from trinessa to tri sprintec, I suppose they just don't carry it anymore. However, they've given me little information other than a small typed note saying this was my birth control, even if it looks different. I called to ask if I should change anything and the pharmacist said no, but it doesn't seem right. Should I be using a back up method of birth control for the first week? First month? Not at all? I wasn't given any warning and I had little time to call the pharmacy let alone see my doctor.