I'm pretty sure I have undiagnosed OCD, the pure O type. I'm having a flare up at the moment so thought I'd reach out try to talk about it here to stop myself spiralling into "I've lost the plot" territory as I know it's actually quite common 
Mine manifests itself as thoughts about harm mostly, for example if I'm at the train station 'my toddler could fall into the gap between the train and the platform' or if I'm crossing a bridge 'I would die if I jumped over this'
When my children were tiny I would get regular ones about dropping them.
I've had slightly less sinister ones too like envisioning myself throwing a drink over whoever I'm talking to.
What intrusive thoughts do you get?