Breast milk or formula?

Hi im fully breast feeding (no pumpin )and my baby is 2months...shes been eatin every 3hours durin the day but last night was different I feed her 12 am for 18mins then she usally gos asleep and wont wake uo till 7am but this time she only slept for half an hour then she was hungry I feed her a anther 15mins then she slept for 29mins then she was hungry again this was goin till 4:20 am..you think my milk is dryin up? I wear those bra pads because my milk leaks but these padt 2 days it hasnt leak! You think my baby gets full with my breast milk? I wanted to give her formula and breast milk but my husband dont want me to give her formula cause he says breast milk is healthyer and formula will hurt the babys stomic..is that true? What should I do?