Are Vomiting And Nausea Side Effects Of Dianette?

I started taking Dianette 5 weeks ago, and i started havin unprotected sex after 5 days of taking it and have been since then. fot the last week I've been vomiting and been constantly nauseas. I've gone off most foods because i find it makes me ill and can only sip water, but this still makes me ill! Also my breasts seem to be bigger and im always tired. I missed one pill 2 weeks into takin it and the day after had an 8 day bleed which is unlike me as my periods usually last 2-3 days, do u think these are the side effects of the pill or do u think I could be pregnant?