Timing question

Quick question ladies. Ttc for a couple of month now. Just got my first positive opk for this month this morning ( Monday ) bad news is my SO is out of town :( !! We BD on Thursday twice before he left. He will be back on wed. Which means my fertile time will most likely be over. We did use pre seed on Thursday. Any chance I will have a chance this month ??! I know it was a few days before o but hoping !! Any encouragement is appreciated :)