Hey Hun, I had this with my first.
Was really frustrating the midwives at the maternity wear never picking it up and swabs were always coming back as negative for signs of fluid, I eventually had a little bit more than a 'leak' and got admitted for a scan as I was measuring small too and turned out I had no water left so was sent for induction the next morning. I'm not saying this is the case for you also just a possibility, a they think I was just leaking everytime I was using the toilet and therefor not noticing. I was induced 10 days before DD but unsure how long before hand I was leaking.
I think the same is happening again but they haven't scanned me yet, going to push my midwife to consider it Thursday though, hope you get some answers xx