Ay, possible talaga yan na namuong gatas, especially kung di ka nag-express or nag-feed ng maayos sa isang side! One of my mum friends had the same thing at first, kaya importante check mo kung balanced ang latch mo or kung may side na hindi sapat na nae-empty. But since wala kang sakit ngayon, mas better pa ring i-check with your doctor or lactation consultant para ma-confirm talaga at ma-advise kung paano ma-prevent pa, sometimes kung hindi handled agad, pwedeng mag-develop into mastitis later on, kaya better safe than sorry!