I don't trust sperm!!!

Kim • We have a 9, 6 and 1 year old. TTC #4!
I'm due for AF June 6 and pretty sure I'm O'ing today. My temp big dipped this morning (96.9) and EWCM for 3 days. Maybe it's a mental thing bc we've been trying 5 months now, but my husband is a firefighter and works a 24 hr shift every third day, and I'm just convinced in my head that if we don't BD ON my O day, it's not gotten happen. They say the sperm can live UP TO 4 days inside of you, and we BD the previous 2.  but he's on shift today and of course my temp dipped. Anyone have any good facts on "trusting the sperm"??  In guess I'm just jaded these days.