+opk now what? HELP

Julia
So I got a +OPK(line just as dark as control) at 4:30pm 7/13 (CD18) then tested at 8pm(same night) and the control line was a tad darker...I tested again before bed at 12:40am 7/14 and the control line was blazing (darker than the control line) DH and I BDed before he past out and now I'm wondering when I'll ovulate I'm new to this OPK stuff so I'm not sure EXACTLY when it'll happen...he's leaving out of town in the morning so does it mean ill miss my window...I'll be testing again in the morning and will until it goes neg again and will upload pics after I test in the morning for you all
P.S I know they say you "normally" O 12-36hrs after the first + but what if you get a darker + than the first?