So I know thus is a really odd one and will probably make some giggle. But I'm 37 weeks and all day today have been having back ache and twinges on and off. And mild period cramps but nothing regular. Well tonight as I'm lying in bed right now baby is moving like a good one but I'm experiencing vibrations in my fanny to put it bluntly happens for a couple of seconds then stops. Never had this before so was curious to see if anyone else experienced it