Hallucinations

I have this tiny problem. When I'm pregnant, I have hallucinations. Like for real, horror movie hallucinations. When I was pregnany with Rylie I would see scorpions crawling on the wall at night. With Davis it was people in my room. And last night it was spiders. I woke up several times throughout the night and saw spiders crawling on my bed. I was not asleep! I was fully awake and really seeing spiders crawling all over my bed. About the third or fourth time I saw them they were crawling on Mikes arm and I took my sheet and tried to squish them. He woke up and asked what I was doing. I told him that there were two spiders crawling on his arm and I just squished them. I lifted up the sheet and there was no spiders. There never were. He looked at me really strangely and I swore to him I was completely awake. We laughed about it and I didn't see any more for the rest of the night. But I really did see them. I even remember standing up and shaking my blankets off because I kept seeing them there. I have asked a doctor before about them and they have no idea what I'm talking about. No one has ever heard of pregnancy hallucinations. Which makes me kinda worry. I hope I don't see something crawling on my husband and try to stab it or something. That wouldn't work out to well. At the time I am seeing them I would swear on my life that they were there, I'm seeing them, why wouldn't I think they were real? I wonder if it has anything to do with a spike in blood pressure or something like that. I don't know but my brain is freaking out. I feel kinda like a crazy person. It's really like in scary movies when someone see's something and then looks again and it's gone. Very strange.