Birth Control and pregnancy?

I have been on Yasmin for several months but only recently have become ual active. My Dr said its ok to skip 2 months worth of sugar pills and only have my period once every 3 months. I would like to have my period once a month again to make sure I am not pregant but if theres an event or something where I would like to skip my period again, is it ok to have my period one month, then skip it for two again and have an inconsistent schedule or is that unhealthy? Should I stick with one or the other?