Late period

My period is 6 days late but I have some white discharge like I normally do before my period but also some clear discharge. My breast are sore like they normally are before my period and I have light cramps. This past month we have used the pull out method and been very careful. Then two days before my period we had an accident and I took plan b the day after my period was supposed to start 29th. If it doesn’t come in a couple of days I plan on testing. Could I be possibly pregnant? Or could plan b be messing with my period?