What Causes Milk Discharge From Breasts While On NuvaRing?

Im 22 years old,I started using the nuva ring about a month ago.I only had it in for 4 days my boyfriend and i hadintercorse and the condom broke.I showered trying to wash out as much as i could without taking the ring out.The next day abou 6pm i took plan b.and got my period that month lasting the 7 days.and i inserted a new nva ring.but today I noticed that if I squeez mynipple a bit of milk comes ot.and i have a almost 9 month old baby