Breastfeeding

My baby is 4 days old I'm strictly breastfeeding and my latching on very well and been doing every two to three hours but my milk came in yesterday and now my breast got bigger and heavier and even when I lay on my side my boobs hurt touching I feel like their engorouged but their haven't leaked and she's nurses well every like 2 hrs what can I do if tho she sucks they don't go down this my third child