just to add my own personal experience;
I have had inflammatory sero-negative(non rheumatoid factor but same symptoms) arthritis for 17 years now. It affects my feet, ankles, knees, hips, spine, neck and hands.
Fought very hard against original Rheum consultant's wishes to stop Methotrexate to TTC and transferred to Sulphasalazine (was also taking Arcoxia, Tramadol and Amitryptaline). TTCd after reading that stopping anti-inflammatory drugs can interfer with ovulation (I stopped taking them for 1 week from day 12). GP and new Rheum consultant said I had to stop all medication and manage on paracetamol.
Felt much better (than before pg) until around 26 weeks. Rheum consultant said I could only have steroid injections, Ob consultant went ballistic and made me see a different Rheum consultant and they both agreed I should go back on Sulphasalazine and take co-dydramol for pain relief.
Everything improved and against all expectations I delivered dd exactly as I wished, squatting and leaning over bed with only the TENS and gas and air.
Also felt pretty good until around 8 weeks after birth and sadly had to stop BF so I return to the Arcoxia anti inflammatory. I am now appreciating how good I really did feel joint wise when pg and its been a little difficult to accept my limitations again and re-learn to cope with constant pain but I don't have any regrets.
I am lucky that I have plenty of family around who are desperate to help out and a wonderful dh although at first it was very difficult for me to accept that I couldn't cope at times, I felt like I was failing dd but 6 months on I am slowly starting to enjoy being a mum and to realise that it doesn't matter if I can't sit on the floor to play with her, we lie on the bed together instead and have lots of cuddles in my special chair.
so after all that rambling about me, I hope this has helped a little, let me know if you have any further questions or need any advice.