Need some advice!!!!

I'll be 35 weeks on Wednesday with my first baby and I've been really lucky so far with my pregnancy, everything has gone the way it's supposed to and me and my baby boy are both really healthy. He's measuring a bit bigger than average but my midwife said thats not a concern.

Last week on Thursday i ended up having to get checked out because they thought my waters were leaking, after being monitored and having a internal examination and doing a million wee samples they sent me home and said my cervix were closed and i wasnt dilating.

On Saturday i woke up and felt AWFUL! My throat felt like i had swallowed a knife and i had really bad cold and flu symptoms but with no fever. Same thing continued sunday and i was randomly sick a couple of times.

Through sunday night/this morning I've felt increased preasure down below and can not stop weeing (sorry for tmi) and I've also started with mild cramping in lower stomach like period pain and quite bad back pain. I don't know what to do? The pain isn't unbearable so i feel stupid ringing triage and midwife but im not sure if this is the start of labour?

Any advice ladies? Could really do with it....