Late and Negative

Hello fellow mommies and future mommies! My husband and I already have one beautiful, carefree, spunky, little girl. She is about 1.5 years old and we decided it was time to start trying for a little brother or sister. We started trying about 8 months ago give or take a couple weeks. We haven't had very much luck this far, but this month it just felt right. I have some pregnancy symptoms that I had the first time and some new ones and I'm over a week late. Normally, I would be beyond excited, but I have had multiple negative home pregnancy tests. So here is my question: Have any of you been late with negative test results and still been pregnant?