I've been taking Yasmin for 2 days now and am experiencing nausea...

I've been taking Yasmin for 2 days now and am experiencing nausea (especially directly after I eat). I have also been experiencing some slight difficulty concentrating, but this could be a side effect from nicotene withdrawal from trying to quite smoking. After reading everyone else's postings I'm not sure if I want to continue taking this medication! I was so excited to get onto birth control again but now I just don't know if this is worth it! I guess I'll wait another month to see what happens.