New style ESA query

I currently get Income related ESA (joint claim with my partner)
I’m in the support group and have been since around 2012 when I became too ill to work.
My partner is my full time carer but hasn’t ever claimed Carer’s Allowance.

I’ve received my migration letter and plan to start the process soon.

I keep hearing about people in the same boat as me ending up on a combination of ‘New Style ESA’ as well as UC.. DESPITE never being on Contribution-Based ESA!

Apparently some people are actually getting a combination of CB ESA and IR ESA without even knowing it!

My question is:
Is there anyway of checking if I’ve been getting Contribution based ESA alongside my Income Related ESA before I start the migration?

It’s the uncertainties that are causing me most stress.

Hopefully that makes sense
Thanks in advance.

Yes to both

I forgot to mention, I’m on PIP as well. Both higher rates.

So does that mean I’ll end up on a combination of Universal Credit AND New Style ESA?
And will that mean more hassle/complications for me and my partner?
Really stressing out at the moment. My heart condition is already exacerbated by all this.
I thought migration would be a lot simpler.