Your hormones are changing and your body is being put through a lot of stress. It's very common to have crazy, wild, and even shocking dreams during pregnancy.
I believe there are prophetic dreams in nature, but what your experiencing is just from being pregnant.
Last night I dreamed my husband was a murderer and I woke up fighting him in my sleep. Pregnancy does crazy thing ;)
Ok this is creepy. I am 9 weeks and I too have been experiencing nightmqres and I have not watched scary movies. I dont think it will cause my baby to be evil though. I thought it was just me....