There are, actually, a number of brands that have the added benefit of stopping a woman's period. It's very common and not anything to get upset about. I guess you must be one of those who actually likes her period unlike many of us who really hate it and would prefer not to have it. Anyway, it's not considered a problem in the medical community, instead it's considered a benefit. But since apparently you actually want a period then you should switch to a brand that doesn't have the benefit of stopping the cycle.
It's not a real period that you get when your on the pill, so whether or not you have a period is irrelevant as far as pregnancy goes. When you're not pregnant, missing a period due to pregnancy generally expected. But while being on the pill, missing your period is a general benefit of birth control pills that has nothing to do with pregnancy. So it's kind of false hope in that regard. But if you really want to have a period for some odd reason then switch pill brands. There are so many out there that I'm sure you'll be able to find one that makes you bleed if that's what you really want.