37 weeks.. mucus plug, back&period pain- sign of labour?

I’m 37 weeks pregnant and these last few days I’ve been having just horrific period pain cramping that radiates round my back and also thighs, causing a lot of pelvic discomfort too..

I’ve been having light yellowish discharge aswell on a panty liner for about a week but today lots of discharge has come out.

Would you say this is my mucus plug?!

Probably every time I’ve wiped today a big blob has come out! So sorry tmi

I also wiped yesterday and had the tiny tiniest spot of light blood on the tissue.

Along with the cramping I’ve been getting tightenings aswell across the belly.. but I don’t want to go in because I’ve been diagnosed with “irritable uterus” where I’m prone to getting contractions which aren’t true labour. But I’ve never had it with the cramping!

Do you think these are all signs that labour is imminent?

What was it like for you?

P.S- sorry I’m very worrysome as I went into preterm labour at 34 weeks which they managed to stop.. so they have told me to be very cautious xx