Ok so I am 21 weeks pg with dc3, all day long I have had mid waist tightenings/pains (just above belly button). I have also had really bad diarrhoea (sorry tmi) for around 3 days now 
I do have a hernia in my belly button so i have put the pain down to that but it's a bit more higher so I have gathered it is not that.
I'm not sure what to do..has anyone got any good advice please?
Thank you in advance