I feel very discouraged

Walker bait • Mother of 3 wonderful kids, my middle child is epileptic and has ASD so I`m a stay at home mom I have been with my husband for almost 7 yrs but only married for 2 yrs. And as happy as can be.
I'm 6 days late but 2 hpt this morn were negative. I have the symptoms but still no bfp. It's very discouraging and I'm beginning to think I should count my blessing I have 3 amazing kids but we really wanted a fourth. Mayb it will happen soon.