Need advice!

First time posting on here but I have been going crazy.

I have been spotting for the past 12 days. My period was supposed to start three days ago but it hasn’t. My boobs hurt more than they ever have before.

However I took a test yesterday and it came up negative.

Could this just be stress screwing with me? Have this happened to anyone else and they end up with a positive test later?? Help ladies!