Oo, totally normal yan, mama! While breastfeeding, ang period mo ay maaaring mag-come and go unpredictably, some months regular, some months delayed or skipped pa, lalo na kung exclusive breastfeeding pa ang LO mo at may night feeds. A few of my mum friends experienced the same thing around 8-10 months ng breastfeeding, and it took a few more months pa bago nag-settle ang cycle nila back to normal. That said, kung worried ka pa rin about the heaviness or the irregular pattern, mas okay na i-check mo with your OB para sure, lalo na kung may gamot ka na tinake, they can give you peace of mind and check if may underlying cause. Hopefully mag-settle na soon, pero in the meantime it's really just your body adjusting while you're still nursing.