Ay mama, it's still possible na may healing pa rin happening down there even at 1 month, especially if it was a tough delivery or may small tears, pero kung random ang pain at hindi mo sure kung ano ang cause, better check with your OB na lang to be safe, kasi sometimes may infection or something na hindi obvious pa. Mas maayos na makita ng doctor para hindi ka mag-alala, especially since you're still in the postpartum window.