Question----Please I need Answers! I'm desperate for help.

Had sex last night, a day before my fertile window, and had mucus stringy discharge this morning. Was wondering if I could conceive from last night? It was a 3.5 fertility score. Today being a 5 and going up from there. Knowing sperm staying in your system up to 6 days. Just wanted someone's input. My husband and I are now going through a divorce.. Sitting here balling as I'm typing this. Just need someone's input. Please.