Is it possible to have a early period one month and late the next and be pregnant?

There is always the possibility to become pregnant (assuming you are able), at any time. Late menstruation is often an early sign that you could be pregnant, but it doesn't mean that you are.

Menstruation also doesn't have to be constantly on cycle. Don't be alarmed if you arn't always on schedule. There is also no way to determine if you are pregnant just by your period, because many things could contribute to having them early or late. It is also possible to have your period while pregnant.

If you're worried that you may be pregnant, contact your Doctor.