I had a dream that my new partner was pregnant…
One thought is- dreaming about someone being pregnant, especially a partner, shows you are madly in love with that person or have a strong or passionate attachment to them.
If someone is carrying a child in a dream it usually demonstrates hopes and plans that are in the making are so far are going well. Perhaps your new relationship is going better than you expected or generally well and that is why you are able to make future arrangements and have hope that you will be with this person for the long term.
More negatively- if you dream that your significant other is pregnant it could mean that you are both travelling in opposite directions and your common goals are lessening the more time you spend together. Perhaps you both need to search for that one thing that will pull you back towards one another and try again?
Pregnancy can also be an indication that you have formed new skills and characteristics and are changing as a person. In other words, you are going through a 'rebirth'.
Another interpretation is that you need to invest time in an opportunity or project that is very dear to you. If you do this for yourself and inject all the passion that's been building into it, this long awaited goal might finally come to fruition.
The Complete A-Z Dictionary of Dreams