Could this be the pill causing this or something else..?

You know, I've had some weird symptoms while on Kariva as well. Like nausea, headaches, late periods, lighter, and then heavier periods... cramping... I thought it could be preggo too, but then I had my period 5 days late, it was extremely irregular though, sometimes heavy during the cycle, sometimes not even having to wear a tampon... it's terrible =[ ... I've take the test, came out negative, but just now burst into tears crying for no reason... what's going on?