Can't seem to get pregnant

I am two days late and have taken 2 tests both negative..I have been trying for a baby with my husband for 10months now..done everything ovulation kits, prenatal vitamins, having sex every other day but can't seem to get pregnant..I don't understand what I am doing wrong and I am 26..It upset me to see the disappointment on his face when I told him I wasn't pregnant..does anyone have any tips on how to get pregnant..