Postpartum Pain

I actually break my tailbone everytime I have a baby. I've experienced the shifting you remember but mine is in my tailbone, not my pelvis. Mine too caused by big babies. I never thought I would want another baby after the first one because it was such a horrible experience. My oldest is 15 years old, but I did decide to have 2 more babies, YEARS later. I now have one that is 2 and another who is 9 months. Both of them you could hear the tailbone break as I pushed them out. 9 months later it still feel bruised and tender. This time though I babied it from the moment I delivered and so I didn't have as much shifting. The doctor prescribed physical therapy with this one as well but I just couldn't manage the time so I didn't do it but it is an option.
With my first child, they had to pull him out with forecepts and my doctor said I either broke it or it's bruised really bad but there's nothing you can do about it. 12 years later, when we heard the crack/pop, the doctor was stunned. She had never heard of this happening before. She did go back to her collegues and talk about it. The 3rd baby they actually had offered the physical therapy as she really did her research and found a therapist who specialises in issues like this for women only. I probably would've done it but we had a horrible scare after the baby was born so he was my focus throughout my 4 month maternity leave. By the time I could've mentally focussed on myself, it was healed enough that I didn't have the shifting which was minimal this time around (although still quite painful), so I just abandoned the idea of therapy.
If you're considering another baby, don't let this stop you :) It does heal and it's worth it. There's could be an option of a c-section too and perhaps that's the best option if they know that your baby is on the large side.

You could try asking your doctor to check you for prolapse. I'm 5 2 and had a 10 pound baby vaginally after 2 hours of pushing. I was out shopping with her (by myself) two days later. I got sore once in a while, but mostly felt great. (I didn't/don't have prolapse, but I worked in that field and know that it could be the problem from what you're saying).

My girlfriend had similar pain after birth and the doctor discovered that she had actually broken her tailbone during delivery (her baby was 7 lbs.). Unfortunately there is nothing they can do for that but give it time to heal.

I had the very similar experience. Mine called SPD, symphysis pubic disorder. My pubic bone was separated and twisted. I could not walk ! I had to use walker, wore belt, and went through physical therapy.
It started during pregnancy, but unfortunately I didn't find out what that was until I pushed my baby out and couldn't walk the next day.
Are you all better now ? I still feel some shooting pain sometime, but not as bad, and I just have to try to fix it using the method they thought me at physical therapy.

I assume that you asked because you're expecting again and not because you're still experiencing the pain?

Anyway, I was in terrible pain after the birth of my daughter. Not the same problems that you had, but I also couldn't walk for two weeks (no exaggeration. The day before my husband returned to work after 2 weeks leave we tried to take the baby for a walk and I had to literally sit down on the sidewalk after 1/2 block!).

Well, I had my son 2.5 years later and it was a piece of cake. No problems and was up and at 'em in just a couple days.

If you think that your pelvis is still out of whack from the first go round, I recommend seeking a chiropractor that can help get things back in line. Good luck!

Magnesium might help with this.

I had the same pain three years ago with my 3rd child. They told me I tore the symphysis. I had physical therapy at the hospital and was sent home with a walker. It hurt to separate my legs when getting into bed or to go forward upstairs or to even stand for a few minutes. It slowly got better but it's never been back to normal.

I moved and switched doctors and my current midwife said it happened because of the position the nurses put me in during delivery. I had an epidural so they just did whatever they wanted with my legs and pushed them all the way up cause this ligament to separate. It makes me furious!

Maybe a chiropractor or physical therapist could help with some exercises cause it sounds like you may be worse off than me:(