I was using a wheelchair for the last couple months. For labour, I'd been told to get MrNC to measure how far I could part my knees at the start of labour, and make a loop of string that size to ensure no-one could try to push them further apart.
Said string got lost by the time I got admitted, but the staff were great. I found kneeling on a 2-level pyramidal beanbag was good, and the birthing pool even better - with g+a it was just about fun.
Sadly after 8 hours I had to get out of the pool and it became clear my SPD was suddenly even worse (incredibly rare, apparently) and the MW said 'You know how you didn't want an epidural unless really necessary? I think you ought to consider it.'
And eventually ds popped out. Did some pushing having been propped into a kneeling position with about a dozen pillows (two strong birth partners helped!)
On the plus side, being so stretchy meant I healed exceptionally quickly, so hopefully that will be the same for you.
My advice is if you're taking prescribed painkillers pre-labour, ensure staff are told that when you are admitted, and demand them after birth - being in agony from SPD when the epidural wore off and then being offered a paracetamol was Not Fun - nor was the next 24 hours of them failing to first get a prescription and then nurses deciding to only give me half my usual dose... I only got the rest when they asked how I was feeling post-birth and I told them my vagina and arse were just fine thanks - but my pelvis was killing me! Suddenly I was taken seriously!
Also try to get help post-birth, sign up for any postnatal physio/exercise classes your hospital have, and practice walking 30 min, 5 days a week - as my physio said, I'd not used any of those muscles for 5 months so would take time to build them up again. And get help - get people to come visit and help rock the baby etc for the next couple months.