In psychoanalytic point of view, it mean something is changing within you or your environment. because pregnant and that thing have one common theme which is transformation. Take note pregnant means fertility which is something "good"
But then, not too seldom, pregnancy can be most unwelcome. Tenkuuken isn't giving out much details as to the mood of the dream and suchlike, thus making it hard to speculate about whether this is a "good" or "bad" pregnancy.
Since we are talking dream interpretation... I had one some time ago that won't leave me alone. I dreamt about three children, all from different human-looking species secretly living on Earth, who had lost their families in being attacked by groups of people that their respective race had been in rivalry with. One of the children, for example, belonged to a submarine race who, unbeknownst to humans, inhabited the seas. Their underwater ships had been assaulted by some kind of monsters, this kid - with blue-green hair and greyish blue clothes - being the sole survivor.
The second child had a "Druidic" appearance; long brown robe and a single long braid in otherwise short, blonde hair. He belonged to a shore-living race called "the Ones who keep Secrets", meaning they specialised since childhood on not giving away any information no matter what the torture.
The third child, ginger hair and seemingly the most traumatizised in of the three I don't remember much about, except that he lived on land rather than in the sea or on the shores.
Anyway, having all lost their loved ones, these children somehow found each other and, scared nearly to death, tried to hide in the harbours they had winded up in. However, they were found by humans living nearby and subjected to much suspision before having told their tragic stories. It was also discovered that all these kids were actually girls who, after the deaths of their families, had disguised themselves as boys, thinking they'd be safer that way. The dream was overall a very sad one.
I can't for my life figure out what these three kids are supposed to symbolise, but it' obviously something, with their distinctive colour schemes and all. Any suggestions?