Thanks for posting your query.
It seems as though your body might be preparing to go into labour.
"Show", which is a blood stained mucous like discharge, low back pain
and the sensation of constantly wanting to go the toilet because of the baby's head coming down, all seems to point to the fact that labour is imminent.
However, it is difficult to predict when you will labour, and some women can go on like this for a few weeks, others may start labour in a few days.
It must be very uncomfortable, but is nothing to worry about, and your symptoms should all remit, once the baby comes.
Hope that helps.