I'm 33 weeks pregnant and went into hospital last Sunday with bad back cramping and blood upon wiping. Long story short, the blood stopped and I had 2 precautionary steroid injections, all obs were great, so they suspect a possible kidney stone (got a scan 7th Jan).
Anyway, they gave me Ferrous Fumarate for slightly low iron - for the past 2 days I've had bad abdominal cramping followed by diarrhoea (sorry, tmi
) but it has been black and watery 

I've just Googled this, and found quite a lot of posts that mention this being an early labour sign?!
Or is this connected to the taking of the iron alone??
I've felt throughout this pregnancy that I may go early (this is my third), I've just had a feeling 
Anyone any ideas as to whether this will just be side effects from the iron or possibly early labour signs?