I agree with Flea. If you really are ovulating on day 13 or 14, days 12 and 13 are your most fertile ones. While you can get pregnant from BD 3 to 5 days before ovulation, its a lower chance than O/O-1/O-2. To be safe you could also bd every 2 to 3 days on either side for a bit as well

Even though DH has a good sperm count, abstaining for those two days before you O is going to make it even higher.
Even though day 10 and 11 are potentially fertile days for you, if you know for a fact that you O on day 13 or 14 those are definitely fertile days and will have the highest chance of conceiving, so again it would increase your chances to "hold back the troops" until then and unleash them all at once iykwim
I'd be going with his advice it does make sense to me.
BTW if you follow his advice I'm betting you have a boy