Right days to BD

So I think the hubby is getting performance anxiety now that it’s been so long of TTCing. I have PCOS and I’m on 4 cycle of letrozole. First month no O as low progesterone but last two cycles did O just didn’t capture it. If I ovulate agin cycle day 16-18 like I have for the last 3 months should I BD everyday from day 15? Too much BDing reduces sperm?? Last month we did it every day from days 14-18- O on 17 and didn’t catch it. Hubby’s SA came out normal. Def BD on day 16 and 17 straight but should I start at 14 or 15 or don’t bother?