Breastmilk

I️ breastfed my baby for 2 months after he was born but had to stop due to lack of milk production. I️ haven’t breastfed or tried to reintroduce it to my baby for 6 months and last night I️ started to leak colostrum from both breast. I️s that normal? Or could that mean that I’m pregnant again? FYI: I️ have the Mirana as birth control.