Could this be it??

[Maclaren]

I am 37+6 with my 3rd DS but I was induced with both the others so have no idea what labour start of labour is like!

for the last 3 days I have felt crap although I felt better yesterday! I have been having a bloody show for the last 3 days also I have been having real shooting pains up my bit and a horrid back ache

Could I be getting close of is it just end of PG?

Hmmm... I have been having shooting pains in back and legs for weeks but that's sciatica for you. Sounds like it could be slow labour though in my limited experience, I definitely knew when I was in labour. However mine came on very very suddenly. Keep us posted!