I recently started on Loestrin 24 Fe (on second month) and have noticed that during the end of the 1st week & into the beginning of the 3rd week I have more frequent heartburn than normal. I was on Ortho-tricycline for a long time and experienced frequent and severe heartburn, but as soon as I switched BC pills it went away. I had not had it as frequently as I have recently and my diet has not changed significantly in the past 2 months. I have noticed few other side effects, mostly consitpation and a bit of nausea, which I can deal with much better than I can heartburn.