Severe SPD from about 14 weeks - almost immediate relief after my c-section. I was moving my legs in ways I'd not been able to in months, and without even realising it. At one point I just stared at my husband and said "I'm crossing my legs!" I rested in bed pretty solidly for about 48hr after, then started to mobilise because it was such a novelty. I hope you experience the same, or similar, relief x
I had severe PGP for my entire pregnancy and needed crutches. I had a home birth and 6m PP I can still feel it a little. Mostly after some light exercise and more like an ache in my SP but still there. Though I can walk and actually lift my legs, cross them and exercise now haha! I was walking and playing with my toddler at 2 days PP so it was WAY better after birth. The thing that lasted the longest was pain in my coccyx which must have been from my labour. That took ages, felt like I'd broken it!