4 days late with AF...Encouragement??

I'm 4 days late and keep getting negative pregnancy tests. I know not everyone is the same, but I just feel like if I was it would show up by now! Everyone around me is pregnant and being so reckless and careless (drinking, no prenatal care, etc). I know it's selfish of me but I just get so angry. Miscarried once already, (nine months ago) so extra emotional about babies and pregnancy sometimes. I have some symptoms but I'm afraid it might be all in my head! Feeling super down tonight... 😞