Keike
Just letting you know (although you may already be aware!) That your "fertile period" actually only lasts about 24-40 hours. If you are using OPKs (ovulation tests) once you see a surge, DTD for three days straight.
If you are not using OPKs but you are still ovulating, FS recommend that you DTD every second night from the end of your period until you either test positive for PG or AF has arrived.
Hope this helps :)
I really hope your DH comes around to your way of thinking ;) and, that as a couple, you can work through this together and be stronger for having gone through it all.
Take care x
n2l