It depends on why you didn't have it. Some women will deliberately run two months' worth of birth-control pills together without a break, in order not to have a period. It's not the greatest thing to do regularly, but it isn't "a bad thing." Some women skip a period for no discernible reason, then go on and have normal periods. That's not a "bad thing" either. Some women do skip a period and keep skipping them, because they are pregnant. Whether that is a bad thing or not, depends on the woman's situation and her interest in being pregnant. If you aren't pregnant and your period remains AWOL, see a doctor.
It's considered irregular and you may want to see your doctor about it. Is there any chance you are pregnant?