38 weeks pregnant- signs of labour? First time mum, please help!

I’m a FTM at 38 weeks pregnant and have been experiencing some really intense pelvic pressure and just pressure in my bum like I need to poo! But I’ve already been today and still get the sensation afterwards it’s very uncomfortable...

I have been experiencing a lot of braxton hicks throughout this pregnancy aswell as I was diagnosed with “irritable uterus” therefore I’m worrying when I get the true early pains I won’t realise it’s the real thing as I get them all the time!

I’m starting to get the tightening pains in belly along with a horrible back pain. Basically I feel dull period cramping constantly and then also tightening that isn’t painful yet just very very uncomfortable like things are being squeezed and squished which makes belly hard.

I’m just wondering whether these are the early signs/stages of labour... and whether anyone else has experienced this at all?

Just a bit worried aswell as baby has been very very quiet today aswell

Thanks! xxx