Did anyone develop Rheumatoid Arthritis postpartum?

I am 5 months postpartum and have bad joint pain. I usually do a light jog on my treadmill with pilates as a workout but lately I have not been able to get through my workout due to severe pain. Last night I did a 5 minute jog and my both of knees and ankles were causing me so much pain I needed to stop. I wake up stiff with back, hip and knee pain. My fingers are always super swollen in the mornings. The weather went from cold and snow to warm and raining the past few days and I have been in tons of pain! I called my doctor and she is doing some bloodwork. I know Rheumatoid Arthritis can develop postpartum so I was starting to wonder if that is what is going on.

Was anyone diagnosed with it postpartum and what were your symptoms?