37 weeks: extreme period cramping and low back pain

Hello, I’m a first time mum, I’m 37 weeks pregnant and for the last 4 days have been experiencing some really really intense cramping and tightening all over my belly, particularly lower abdomen, that spreads to my back and causes horrendous back pain! It also spreads down to my thighs and just gives me a sore bottom area aswell🙁 Feels like on my period x10 and everything is being squeezed during an intense moment! And will then feel vaginal shooting pain as if baby’s head move down lower during the pain or hits a nerve?

It tends to happen more during the evening, and has gotten worse each night it happens.

The pain is an uncomfortable constant but will get moments where everything becomes so intense and quite painful (not just uncomfortable-unless I’m being a woss)!! I don’t really know what to expect obviously. I do start to worry and think something is happening but I try and sit through it and end up falling asleep and wake up all ok!

It’s gotten so bad again I’ve had to write a post for advice, is this signs labour is near????

I think I’m getting contractions but don’t want to call or anything as I know they will probably die down like the last few nights or manage to sleep through it.

PS- I went into preterm labour at 34 weeks which they managed to control.. and did a test where it came back positive for higher chance of going into labour in the next few weeks.

Just any advice would be really appreciated! I will definitely call triage if gets really bad xx