Af due in 3 days

My af is due in 3 days for the last week I have been getting cramps at the bottom of my stomach I don't normally get cramps until af has started I have been very tired boobs are sore look bigger the last 2 days I have had been feeling very wet down there today I have very sticky discharge like glue I have never had this before just wondering has anyone else had this before and what was your outcome