i went and got a 3 month supply of Loestrin 24 Fe from my doctor ...

i went and got a 3 month supply of Loestrin 24 Fe from my doctor about a year ago and have attempted to take it twice before, but i would quit taking it before it had even been a month the first 2 times because i would get my period a couple weeks early and it would be super heavy and i would get horrible cramps, and my period is usually light and i NEVER get cramps and i just didn't want to deal with it! So I finally sucked it up and took it for the third time. i just completed the pack and today i took my first sugar pill, but no period yet... i'm a little worried, but i'm going to the gyno next week to ask her about it. but yeah, lots and LOTS of nausea for me. also my breasts got bigger. i wear a DD cup as it is, and even that's getting small on me now, and i don't know what to do about it = / but the main thing that has been affecting me is i have been just really lethargic since i have been taking it. i've just been really lazy and i've definitely gained weight. but that may be just from not going to the gym and opting to stay at home and eat instead. i'm not really sure? but yes, two biggest things have been nausea, and a slight depression/laziness. i'm hoping it will go away by 3 months, or maybe i will switch to something else before then. any suggestions of what to take would be great. and also does anyone know if you can have sex while on the brown pills, even if you don't get your period?