"this was the first bc i was put on. bled continuously for 6 months. my ob/gyn prescribed it to take so my periods would stop, so 6 months of that was enough. i also have migraines, which i take topamax to prevent, but with the previfem they were coming nearly every other day. extreme nausea and regular vomiting were also lovely side effects i experienced. i switched to gildess or junel, depending on which the pharmacy had in, and they were both a dream. none of these symptoms except for occasional nausea, so i took it at night to remedy that. gildess and junel are also used to regulate hormonal migraine headaches, and they both helped tremendously. i just got the nexplanon, but will go back to gildess/junel if i don&#039;t do well with it."