Ah mama, totally understand your worry, pero yan ay actually normal especially kapag pure breastfeeding ka pa, ang prolactin from breastfeeding talaga ay nakakaaffect ng cycle, kaya maraming moms namin na ganyan din, may regla once or twice then nawala ulit for months pa. Since regular ka naman before at wala kang ibang symptoms, most likely yan lang side effect ng breastfeeding, pero to be sure and para matulog ng mahimbing ang loob mo, mas better na i-check mo talaga sa OB mo, hindi mo kailangan mag-PT kung gusto mo, pwede lang sila mag-examine or blood test para makita kung ano ang happening. Mga kaibigan ko dati nervous din sila pero after check-up nila okay lang, so go lang to your doc para peace of mind mo okay?