I've been on Minastrin 24 Fe for about 8 months and went to my gyno to switch pills because I had breakthrough bleeding every month. She switched me to Gildess Fe 1.5/30. I finished my pack of Minastrin and after my last placebo pill I started taking Gildess. My question is am I protected from pregnancy right away? I had unprotected sex with my boyfriend on the last day of the first week of pills (saturday). Since the dosage is different, should I have been using a back up? I've never missed a pill, and take them around the same time everyday. I got my period every month when taking minastrin.