Another ovulation question

my cycles haven't been completely regular since our loss in December so I start tracking on strips about a week before glow says is my fertile week. last night and this morning I had a crazy amount of EWCM so was expecting an instant lh surge on today's test (that's how things happened when we got BFP). but it seems like these tests are taking like 10 mins to fully "read" second from bottom is last night, bottom was about 30 mins ago.....we BD the last two nights just in case anyone but just wondering does the EWCM happen day of ovulation or before?