Finger popping ???

Hi ladies I wanted to know if any of you have had your finger pop after having your baby ? I’m 3 months postpartum and at 2 months postpartum I noticed my right thumb would start to kind of pop when I bent it and un bent it. Here’s the weird part it only happens at night like once I go to sleep I’ll wake up around 3 or 4 to feed and change baby and it will pop. I have to keep my finger straight so I don’t have to feel it pop. It doesn’t hurt it’s just uncomfortable. Once I wake up it does it for a little while then through out the day I’m fine . It’s not swollen and i haven’t hurt it either.