I'm 21 years old and have been on a few different birth controls ...

I'm 21 years old and have been on a few different birth controls since i was 16. About two weeks ago i started taking Loestrin24 Fe and I'm not exactly sure what i think. I've read numerous blogs on here about everyone else side effects which makes me feel better because I'm experiencing the same "brownish pain in my ass discharge" too. which is not something I'm happy about at all. I've never had a problem with this kinda thing in the past. and I'm not suppose to have my period for another two weeks, so what is this brown stuff all about?? also,my breasts have been tender too. I'm going to give Loestrin24Fe a chance but if something doesn't change soon, I'm switching back to Seasonale which i didn't have no problems with at all.