Need Your Opinion! LH Surge yesterday or today?

Ashley • I`m 34 and a SAHM to our 3 1/2 yr old son. TTC for 15 months and now Baby GIRL is due October 14th!!!!
​I took an OPK test Saturday, two yesterday (middle two), and one so far today. There is clearly a rise in LH but would you say yesterday or today was the real LH surge? DH and I have been BDing once a day during the fertile week so hopefully we'll be covered, but I'm trying to see how long we need to keep trying.