I am taking Tri Sprintec now, after switching from Caziant. I started taking it on the Sunday pill, and I want to know if I need to use another form of protection? I have been on Caziant for 4-5 years, and I have been taking it regularly and have never had issues with it. I switched to Tri Sprintec because it was easier for me to pay for, and I wanted to know if anything is changing by taking it on the Sunday I would end my placebo pills? Thank you.