I'm currently 14 weeks with #3 and feel I should know what I am doing but don't 
I have really bad lower back ache just above my butt, either side of my spine. Aches as much whether I am standing/sitting/lying down (although slightly less if I am lying down twisting my legs!)
I've not suffered any back pain before.
I am weeing more but then I can't tell if it's any more than usual, no real pain but now over analysing it all!
Sound like cystitis in anyone's experience? If it is will pharmacies give you OTC treatments when pregnant or am I looking at a GP trip tomorrow?
TIA!