Is Lactation Normal While On Cilest Pill?

Hi there, I have a 15 month old daughter and stopped breast feeding when she was 8 months old due to her biting! I waited 6 months for my body to naturally return to normal menstrual cycles and for my milk to dry up before returning back to using Cilest pill, which works well for me. I have been back on Cilest now for a week and I am lactating again - is this normal? Should I worry? Consult my GP again? It doesn't bother me, I just want to check that it's normal. Thank you - Sami