My boyfriend works night at this warehouse store ans some of his fellow workers had been telling him that the had been seeing this little boy playing around by his side for days now, a little after that I came to find out I was pregnant with his baby. Also my mother told me that when she was pregnant with me she would see a ghost of a baby girl roaming around the house. Does anybody know why this happens?

Firstly you ask your mother under what circumstances she was when she was pregnant..
When you are deeply involved into something then the image in your brain may reflect in the surroundings(which is just an illusion). For example when some people fell in love they used to think about their girl friend all the time and when they encounters somebody she would just seem like his girlfriend because he is deeply involved in a subject called 'love'. In the same way the object in your mind which you think more will usually reflect this just an illusion nothing to worry...

Firstly you ask your mother under what circumstances she was when she was pregnant..
when you are deeply involved into something then the image in your brain may reflect in the surroundings(which is just an illusion). For example when some people fell in love they used to think about their girl friend all the time and when they encounters somebody she would just seem like his girlfriend because he is deeply involved in a subject called 'love'. In the same way the object in your mind which you think more will usually reflect this just an illusion nothing to worry...

I think it is a lot early to call it just an illusion. You seem to dismiss what you don't understand.

To OP:

What may be happening is that your senses are heightened by the pregnancy. And it may run in your family. Knowing before seeing is nothing to be afraid of. You have a connection with your child and it may well be a boy. Let us know.

I've heard of several people having pregnancy related haunts. I do not believe it is an illusion... this is something many people experience. I, however, do not believe these to be the spirits of you or your child. Be careful with it.