I would have to say that mine was a weird buzzing sensation *down there* from 1DPO until I was 8 weeks pregnant. From 1-12 DPO I thought I was just plain insane/symptom spotting... but then when it continued I knew it was not in my head. It stopped around 8 weeks and I have had it for few day increments every now and again (including the past few days). I'm serious! You can't make this stuff up! I think it must be related to an increased hormone - estrogen or progesterone?? There is only one other person in cyber-land that I know (from Wb) who said she had this symptom!
What about you, what weird symptoms have you had??