Being pregnant in a dream doesn't necessarily mean having a baby. It can mean that you are 'gestating' something new - could be a new career and new something that you are nurturing.

I used to have dreams that I was pregnant and it would be related to an idea that was at the back of my mind - i.e. thinking about going to university, changing career/job/house/state.

Your signature says you are a teaching student - maybe you are caring/nurturing your blossoming career as a teacher?

Hope that makes sense.