Hi, sis! First thing, please ask your doctor or nurse kung anong specific pills ang pinag-uusapan mo, kasi depende talaga sa uri at kung breastfeeding ka pa.
Pero generally, maraming pills ay safe kahit may regla ka at kahit nagbibigay ka ng gatas, pero kailangan talagang i-confirm with your OB or pediatrician para sa peace of mind mo, lalo na since mixed feeding mo. A few of my mum friends had the same worry, at sinabi sa kanila ng doctor exactly kung alin ang safe, so worth asking talaga!
Since mixed feeding ka naman, mas may options ka pa, pero doctor pa rin ang best person na magsasabi. Take care, mama!