I agree about getting hubby tested, a lot of fertility issues are male related! You can buy ovulation tests strips cheap, check this site out http://www.early-pregnancy-tests.com/. I always had good luck with them but not the temping.
If you have a 28 day cycle, you should start the bd (bed dance) around cd 10-11. The sperm can live for days where the egg is short lived. Better to have the swimmers ready and waiting! A good schedule to try would be CD 10,12,14 and 16 just in case you are a late ovulator!
Be sure you are not using any lubricant. Even stuff like astrogluide that doesn't have spermicide in it can impede the swimmers. The above web site sells a product called pre-seed-it worked well for us. Be sure you are staying laying down for at least 10-15 minutes after. I have a bit of a tilted uterus so doggie style worked best for us when TTC.
-------------------- Taking it one day at a time.....